TTRPG Foes - Stats, Lore, Design

Design

Monster stat blocks are too complicated! You only need to know three numbers: HP, Defense (or AC), and Damage. That's it! Maybe some notes about something special about it or the way it acts. Reader, you might be asking "what about this or that stat?" Sure. A to-hit bonus for example. Let me then rephrase my previous statement. You only need three numbers to describe an individual statistic.

I'm going to give you a game design tip from classic D&D. In classic D&D, every monster's stats were based on their number of hit dice. A monster with 3 hit dice had a +3 to hit and had the same saving throws as a level 3 fighter. That's very slick. It gets better! Monsters tended to appear with other monsters with the same number of hit dice. In fact, a dungeon would be several floors deep and the monster's number of hit die tended to match the floor number! Therefore, the saving throws and to-hit bonuses could easily be written on the map! What does that describe? A global statistic; in other words, a number representing the average statistic of an NPC in an area, room, or scene with a set difficulty.

So, consider treating each enemy as having individual stats like HP and what kind of damage it does, and treat each enemy has global stats that are dependent on the difficulty that the game's designer (the GM) set for the room. This simplifies prepping and running the game! Imagine determining that all the monsters in the room have a +4 to hit? Why should it vary? Really, what difference does a +1 or +2 make?

This is a supplement to a 2d6 game I wrote about here. Note that NPCs are not designed with the same logic as a PC! Here is a breakdown of statistics to use for NPCs:

• Hit Points (HP): How much points of damage an NPC can take. NPCs typically die at 0 HP. The game assumes generally low hit point values.
• HP values given are average for that variety of NPC.
• Small, weak enemies (ex: goblins) typically have 2-3 HP. They typically die in one hit.
• Human combatants typically have 5 HP and can typically survive one hit.
• Many enemies have 10 or so HP to reflect that they are comparable to a PC.
• Enemies that are larger than humans, lions, bears, or ogres, have 15+ HP.
• Giants and dragon tend to have 20 to 30 or more HP.
• Defense (Def): How hard the monster is to hit.
• 9 is the basic number a player needs to roll to succeed in the 2d6 game; however, individual monsters can have their own defense.
• Defense could easily be tied to the global difficulty.
• Damage (Dmg): It's attacks (claw, bite or weapon for example) and the number of damage dice it rolls for all of its attacks!
• Often, the damage will be based on the weapon it swings or its size class! A human-sized monster will do damage comparable to humans, a monster that is double the size of a human, like a lion, bear, or ogre, will do 2d6. Giants and dragons can be assumed to do 3d6.
• When "by weapon" is given for damage, this means you refer to typical weapon damage and even typical barehanded damage. 
• To-Hit Bonus (Hit): The bonus added to a monster's 2d6 toll to hit.
• This number is typically not written and is left up to the global difficulty.
• Damage Reduction (DR): This number is subtracted from damage received representing the amount of protection provided by the armor worn by the NPC, or sometimes a natural armor provided by a natural armor or armored body.
• If this number is not given, treat as 0. Most NPCs are considered unarmored and so they reasonably have a 0 DR.
• 1 DR is comparable to light armor.
• 3 DR is comparable to heavy or metal armor.
• Saving Throw (Save): Some attacks force a PC or NPC to make a roll to reduce the harm or to avoid some effect. The save represents how well a character is able to successfully avoid or resist an attack.
• This number is typically not given and is left up to the global difficulty.
• Classically there are different kinds of saves for different kinds of attacks. They usually break down to dodging an effect that can be dodged, or to resist an attack that cannot be dodged with either physical toughness or mental resilience.
• An NPC can be considered good or poor at a particular save as it suits them. A flying enemy may be considered good at dodging while airborne, etc. A warrior may be good at resisting fatigue. A wizard may be good at resisting mind control. Use your judgement. If an NPC is considered poor at a particular save, simply do not let them use the Save bonus offered by the global difficulty!
• Movement (Move): How far a character can move per turn. If move is not given, assume the typical movement for this NPC.
• If using grid and mini play, Move is typically six inches or one pencil length.
• If using theater of the mind, assume approximately 30 ft as typical.
• If using zones, one zone is typical.
• For simplicity, consider there are only three speeds: Slow (half a pencil length), normal (one pencil length), and fast (one and a half pencil lengths). If any move penalties are applied, assume that the character's move is lessened by one (ex: from fast to normal or normal to slow).
• Notes: Special notes are given under the stats about what characters can do and how. The stats and these notes both imply lore without describing it.

MONSTERS LIST

I believe that your monster list ought to be curated meaning you don't include everything! Your setting is not a kitchen sink. Below I have provided a curated list of stat blocks that might be found in a low fantasy setting. Some of the more fantastic things would occur rarely.

Alligator / Crocodile

HP 10 Def 9 Bite 1d6+2 DR 1

If bitten, you are automatically grappled

If grappled, the alligator can deathroll for 2d6 damage

Alligator / Crocodile, Giant

HP 18 Def 9 Bite 2d6+2 DR 3

If bitten, you are automatically grappled

If grappled, the alligator can deathroll for 2d6 damage

Bear (Grizzly or otherwise)

HP 18 Def 9 Bite or Claws 2d

Beastman (aka Hnoll, spotted, furry body resembles a man, head like a hyena)

HP 12 Def 10 Dmg by weapon or 1d6 bite

Blood Frenzy: Beastmen prioritize bloodied opponents

Bogyman (AKA Troll)

HP 15 Def 9 Dmg based on weapon

Regeneration: If slain, recovers in 24 hours with +1 to max HP and damage unless burned and beheaded.

Bugaboo (AKA Goblin)

HP 2-3 Def 9 Dmg based on weapon

Bullman (AKA Minotaur)

HP 20 Def 9 Hoof, Horns or Weapon 2d6

Gore - If gored, make a brawling check to avoid being grappled

Chimera (AKA Amalgam)

HP 25 Def 10 Claw, bite, Ram, etc. 2d6

Fire breath (15' Stream) 2d6

Tail can bite and inflict poison

(The) Damned (AKA)

HP 10 Def 9 Dmg by weapon

Weak to silver and magic

Deerman

HP 20 Def 9 Hoof, Atlers, or Weapon 2d6

Doll (AKA Golem)

HP 12 Def 9 Dmg based on weapon

*Immune to charm, sleep, paralysis, poison

Cannot fail morale checks

Dragon

HP 30 Def 13+ Claw, bite, etc. 3d6 DR 3

Fire breath (either 15' cone or 25' line) 3d6

PCs save vs fear or difficulty +1

Eaterman Bush

HP 10 Def 9 Dmg 1d6-1 (minimum 1)

Elemental, Major (Earth, Water, Air, or Fire)

HP 15 Def 9 Dmg 1d6+1

Not harmed by mundane weapons

Elemental, Minor (Earth, Water, Air, or Fire)

HP 8 Def 9 Dmg 1d6-1 (minimum 1)

Not harmed by mundane weapons

Elf

HP 10 Def 10 Dmg by weapon

Magical Bloodline: Bonus to Saves vs Magic

Affinity to Woods: Bonus to track and hide in forests

Fiend, Major (AKA demon or devil)

HP 15 Def 9 Dmg 1d6+1

Not harmed by mundane weapons

Fiend, Minor (AKA demon or devil)

HP 8 Def 9 Dmg 1d6-1 (minimum 1)

Not harmed by mundane weapons

Ghost

HP 10 Def 9* Touch 1d6 (max HP)

Life drain: damage is applied to max HP

Not harmed by mundane weapons

Levitates

Intangible

Griffon

HP 20 Def 10 Dmg 2d6

Flies

Big and strong enough to carry a human

Hangman's Tree

HP 30 Def 9 Strike 2d6 DR 1

Strike with branches and throw or pin, or ensnare to grapple!

Homunculus (Plural Homunculi, AKA artificial human, a product of alchemy)

HP 5 Def 9 Strike 1d6

Defect: The creation process is too precise. No two homunculi come out the same. All have a defect; if not physical, then mental.

Hybrid (any non-typical creature with features of two or more creatures, typically a product of alchemy)

HP 10 Def 9 Dmg by weapon

Leech (AKA Vampire)

HP 20 Def 10 Dmg 2d6 DR by armor

Liger

HP 30 Def 9 Bite 2d6

Makes charge attacks - jaws first and pins the target.

Lizardman

HP 5 Def 9 Dmg by weapon 1d6-1 (min 1)

Vulnerable to cold

Manticore

HP 20 Def 9 Claw or Tail 2d6

Tail has a 10 ft reach

Spike 30'

Nymph (Including siren, dryad, Ice Maiden, Venus)

HP 5 Def 9 By weapon

Charming Appearance (nymph): Upon sight, men save vs charm

Charming Gaze (dryads) or Song (sirens): when in seeing or hearing range, save vs mind control

Ogre

HP 18 Def 9 Dmg 1d6+2

+4 to Brawling

If hit, save vs being knocked prone!

Ratdog (a rat-doberman mix)

HP 8 Def 9 Bite 1d6-1 (min 1), Save vs Disease

If bitten, Ratdog can choose to grapple with its jaws

Ratkin (creatures resembling rat men about two feet tall)

HP 2-3 Def 9 Bite 1d3 + Save vs Disease

Reaper (reaper is a class; each reaper is an individual fulling the role of a reaper uniquely)

HP 20 Def 10 Dmg by Weapon

Green Flame: Cast a projectile of green flame (1d6); if hit, you are ignited

Eerie Lantern: When lit, this light stuns the living with fear. Roll to save.

Dirge: Sings a song that quells hostile undead

Passage: Create a passage to the afterlife.

Revenant

HP 10 Def 9 Dmg based on weapon

Undead, but retains their personality although twisted with a need for vengeance

Immune to charm, paralysis, sleep, poison

Does not heal

Cannot fail morale checks

Scare Crow (enchanted object)

HP 5 Def 8 Dmg 1d3

Call Swarm (of crows) up to 3 swarms. Swarm has 10 HP, Def 9, and does 1d6 damage

Command Swarm (of crows) attack for 1d6 damage

Skeleton

HP 5 Def 8 Dmg 1d6 Move Slow

Slime (a product of alchemy, rarely occurring in nature)

HP 5 Def 8 Dmg 1d6

Acidic; -1 to equipment on contact

Not harmed by mundane attacks

Snake Bearer (AKA Ophiuchus) 

HP 5 Def 9 Dmg by weapon

Its left arm ends with the head of a venomous snake! On a hit, save vs Poison.

Snakeman

HP 5 Def 10 Dmg by weapon

Its left arm ends with the head of a venomous snake! On a hit, save vs Poison.

Snatcher (AKA Harpy)

HP 8 Def 10 Dmg 1d6

Flight, fast speed

Spider, Giant (a 3ft tall spider)

HP 10 Def 9 Dmg 1d6-1, min 1, save vs Poison

Web, save vs Grappled!

Titan Snake (Aka Goliath)

HP 40 Def 9 Bite or Constrict 3d6

Snake (ex: Viper)

HP 2-3 Def 9    Bite save vs deadly poison

Wil-o-wisp

HP 2-3 Def 9    Dmg none

Not harmed by mundane attacks

Flies and sheds light like a torch

Hypnosis upon sight: Save or follow it, possibly until you die of starvation

Witch (AKA Hag, Crone)

HP 10 Def 9 Damage by spell

Sleep (AOW up to three within 15 ft)

Deep Mist: Creates an area of concealing, chilly fog. To-hit -2!

Poisonous Touch vs 1 within 5 ft. Save vs poison.

Curse Word vs 1 within 30 ft, save vs disease, mute, or blindness

Illusionary Foe within 60 ft: Conjure an illusionary foe to district and chase one PC.

Conjure Demon or Elemental within 20 ft.

Enchant Object: Create an NPC such as a scare crow from one large object or many smaller objects

Petrifying Spit (10 ft) vs 1: Save or become stone!

Either Fly or Port - a witch can fly for the duration of the encounter, or teleport as a movement for the duration of the encounter. Her normal movement is doubled.

Frost Bolt (1d6): Cast a ray of chilly air and ice at one Character! On a hit, the creature's move is reduced to half their normal move.

Scry: Remotely view a scene in a reflective object, usually a crystal ball or the surface of water.

Create Zombie or Golem (requires one workday): The witch can create a revenant or zombie from a corpse, neither of which is obedient, or a golem from a mixture of human ashes mixed with clay. 

Werewolf

HP 10 Def 10 Claw or Bite 1d6

On a hit, save vs curse of the werewolf (lycanthropy)

Requires silver weapons or magic to harm.

Wolf

HP 5 Def 10 Bite 1d6-1 (min 1)

If bitten, wolf can choose to grapple

Zombie

HP 10 Def 9 Dmg based on weapon Move Slow

Grapples first, then bites

Immune to charm, paralysis, sleep, poison

Rots and stinks

Cannot fail morale checks

Seven Rules for Monsters in TTRPGs - Your Fun is Wrong

First Rule of Monsters

Monster means monster. Monsters are not people, they are monsters. Do not humanize the monsters. This keeps monsters monstrous. Any exceptions blur the distinctions between men and monsters and makes monsters mundane and familiar. Mundanity and familiarity are antithetical to what makes us feel fear which is the unknown and things beyond our control.

Second Rule of Monsters

The monsters don't want to win; they want to eat; they want to breed; they want the thrill of the hunt; they want bloodsport; they want to hear your screams; they want to corrupt your soul; they want to serve the devil; Sometimes ritualistically.

Third Rule of Monsters

If your monsters could be replaced by humans, use humans instead. This ensures that when monsters do appear, they're doing something that men can't or won't do! It keeps monsters weird and strange.

Fourth Rule of Monsters

Use fewer monsters, both in quantity and variety. When you use a group of monsters, keep it homogenous, treat it like a hoard. When you use one monster, it becomes a big set piece monster. This keeps scenes or moments with the monster distinct like a monster movie.

Fifth Rule of Monsters

Knowledge is power; There are no experts on monsters! There are no scholars and no lore books. Even if there were, you could never attain complete knowledge of the monster. Monsters are the unknown things that go bump in the night! For every one thing that folk think they understand about monsters, there is something they don't understand!

Sixth Rule of Monsters

Monsters are a puzzle. They're not something familiar but with a twist. What do they want? How do they get it? When or where are they most dangerous? What is their secret weakness? No die rolls will grant this information. Adventurers must gather rumors, listen to the tales, scout cautiously, observe from afar, set up a trap, and be ready to run.

Seventh Rule of Monsters

Monsters are not balanced for fun. They're faster than you. They're tougher than you. They hit harder than you. You don't understand their powers, and maybe you can't.

Human‑Centric Fantasy Settings: Why Monster PCs Break Tone

Why Human-Centric Settings

Here's the real reason for wanting a human-centric setting. Personal taste. This article is not about convincing you to agree because I don't expect to be able to. Persuasion doesn't work like that. This article is about giving you the perspective of people who don't want monsters as player races, among other features of generic fantasy. It's not about the right or wrong way to have fun; it's about why I can't have fun the same way you can.

Monsters are Monsters

Let's start with the strongest point before I peter out at the end. Monsters are not people; they're monsters. When you humanize the monsters by making them a player-race or by making them equal or similar to humans in mind or spirit, they cease to feel like monsters. I want monsters to be the things that go bump in the night. They are the things that hunt us. They lurk off the edges of the map. If you can play a monster (i.e. kobolt or goblin or half-orc player character), then monsters aren't monstrous; They're just exotic people. It trivializes what it means to be a monster. I want my fantasy monsters to resemble the monsters of the horror genre. You can't have a setting where monsters can be both monsters like in a horror genre but also exotic people like in modern kitchen-sink high fantasy. The exception is if you want to reestablish what is considered a "normal" race, but for me, this exception still spoils monsters because there is this imaginary line that distinguishes humans from monsters, and every exception blurs that line and diminishes the certainty of the distinction.

Tone Matters

Second, it's about tone. Modern D&D feels like playing A Very Muppet Fantasy because of the variety of clashing appearances and fictional cultures the fantasy races present. I've heard and read criticisms that refer to 5e D&D as kitchen-sink fantasy because, like the kitchen sink, there's a little bit of everything. It lacks cohesion and consistency, like macaroni and glue on the Mona Lisa. There isn't a regard of how things fit or consideration for whether it belongs there or not, and the audience has to adjust their suspension of disbelief to accommodate it. In the last 5e gaming group I was in, I felt like Eddie Valiant in the movie Who Framed Roger Rabbit, but I would have rather felt like a character in Lord of the Rings or Berserk. In case you don't know, Eddie was the straight man in the sense of a straight-man silly-man dynamic, among a cast of silly-men. My experience with 5e is that the monsters as player races make the game feel cartoony. The cartoony-ness spoils the tone I would like. I didn't like it. It wasn't to my taste.

Speaking of tone, what is it? It's the mood or atmosphere. Think about the difference at a happy kid's birthday party vs a party for adults with depression. They have different moods. Some things don't mix. You shouldn't mix Lord of the Rings with Rick and Morty, for instance. The tone of Rick and Morty spoils the tone of Lord of the Rings. Tonally, they don't mix. Generic fantasy permits you to mix Peanut Butter and Pepperoni (I call it peanut-pepper butter-oni) and dip it in olive oil. One thing spoils the other thing.

Kitchen-Sink Fantasy

Don't be insulted but kitchen-sink fantasy is plebeian fantasy because it is fantasy for everyone without discerning taste and people who don't know about the craft of acting or drama or of history. It tries to satisfy as many people as it can all at the same time. It's generic as opposed to specific. By generic, I mean it is "of the genre" in the broadest sense of the word genre, permitting everything under the fantasy category; but by specific fantasy I mean something curated and intended to create a more specific aesthetic, sensation, mood, theme, and style. Specific fantasy appeals to a narrower audience, not necessarily an audience with superior tastes but with specific tastes.

The Fantasy Slider

The definition of fantasy as a genre is "fiction plus magic or supernatural elements". That's it. Nothing about what kind of magic stuff or how much of it. So, imagine fantasy as a dial or slider. At the lowest setting of 1, you might get something like Liar, Liar with Jim Carry where a boy makes a wish on a birthday cake so that his dad can't lie. Crank it up to 2 and you might get Legend of King Arthur, where the quantity of magical elements is few and uncommon. There's one magic sword, one wizard, one lady of the lake, and one holy relic to find. There are no dragons and no potions of gaseous form. At the highest setting of 10, you might get Baldur's Gate 3 where you start off on an illithid spaceship and end up visiting hell, and one of your companions is a half-elf vampire. It's a mess and I don't like it.

The Problem of Expectations

Expectations are the hardest thing to establish for an TTRPG, and I think kitchen-sink fantasy makes this more challenging because not there's too many options. If I invite you to play in a game with me, I have no idea what your experience with fantasy is, and I have no idea what kind of fantasy you like. This is why D&D classically had an Appendix N which referred you to the works of fiction that inspired D&D.  If I tell you I'm running a low fantasy game, are you thinking that it's fantasy with the slider on a low setting, or are you thinking it's low fantasy as in the sub-genre low fantasy which has a more specific definition than fantasy. If I tell you I'm running a game using 5e D&D, then I think your expectations might immediately go to Baldur's Gate 3 even if I tell you "LOW, LOW fantasy". Are you thinking about a fantasy equivalent of the Marvel Avengers? Are you thinking about Adventure Time? Are you hoping for a western or a gangster movie? Appendix N may help you narrow people's expectations down.

Magic, Monsters, and Variety

Now let's break the fantasy elements down into their own sliders. Fantasy is a slider, magic is a slider, monsters is a slider. Lord of the Rings is high fantasy because it is set in its own fantastic, non-Earth setting with its own history and mythos, but on the magic slider it's low because only wizards can do magic and there's like five of them. Furthermore, on the monster slider, there might be a massive army of orcs, but the variety of monsters is limited; you can't put a 300-page monster manual together based on the monsters of Lord of the Rings, so, let's say it's in the middle. Lord of the Rings has epic stakes: the fate of Middle Earth. That's usually a feature of high fantasy. With low fantasy, the stakes tend to be more grounded. In Conan the Barbarian for example, the stakes are very local.

The Master Fantasy Checklist

The last thing I want to give you is the concept of a hypothetical master checklist of all fantasy concepts. I'll call it the master fantasy checklist. It's got everything on there from magic wands that shoot jets of colored light to dragon shouts to magic gemstones made of condensed ether that let you cast spells to sticking bits of metal in your tummy and getting powers based on the type of metal. When you define your specific setting, you check off items to include it in the setting. Let's say if you check off 75% or more of the boxes, that's kitchen sink territory. This is because the list is so massive. If you check off 10% or less, that's focused, specific, or niche. It likely qualifies as a dedicated subgenre. If you check off 30% - 49% (meaning you're excluding more than half of the list), that's a curated Variety Fantasy. I think you should aim for Variety Fantasy on any regular day. Less is more and keep it simple stupid are axiomatic; you might believe that getting rid of excess (bloat) leads to greater satisfaction, or you may believe that restrictions breed creativity. Maybe you agree?

Monsters in Fiction

What is a monster? Monsters are the personifications of things we fear and the unknown. They are not people. They are not intended to be or represent people. Monsters are placed into stories that try to describe things that go bump in the night and to evoke some macabre thrill, fear, or disgust in the audience. Monsters are dangerous and opposed to mankind. Either they're malevolent or simply indifferent to our suffering. They are characterized by extreme vices, strange powers, and mysterious weaknesses. They are meant as obstacles for the brave or wise to overcome, avoid, or flee from. Sometimes, the innate inhumanity they represent reinforces our humanity.

In the context of literature, a foil is a type of character who is used to contrast another character, and the effect of using a foil is to emphasize specific characteristics of one or the other character. Simply put, a good character's goodness is emphasized when compared to a bad character's badness. Monsters are the foil of humanity, and so it is inappropriate to humanize them. To humanize the monster is to make it into a new variety of a human with a variation on human morality and human thinking and human feeling. It suggests that on some level, every thinking thing is similar or the same. To do this is reductive to the purpose of monsters. Humanizing monsters takes away from their potential for mysteriousness and alienness, and it minimizes the horror of the unknown that they represent. The audience is meant to hear the pitter patter of its nails in the dark or its grim laugh, and to see the signs it left behind, not to learn about its complex social order and psychology. For some audiences or gamers, this is the premise of monsters that we desire. If you want to treat monsters as people, you ruin this premise of monsters for the rest of us, and you are a spoil sport. 

Were I to write my own TTRPG with a monster book, this is the text that would precede the rest of the book. I would elaborate with this. The lore of a monster is what is known about it, or thought to be known, by people in the setting. Lore is therefore incomplete and not guaranteed to be true. The Game Master or GM, being the curator of their game and setting, may change lore to suit it. The characters in the setting may be assumed to have no knowledge of the lore, and so they have to consult with experts. The characters must seek out and arm themselves with knowledge in preparation for their confrontation with danger. Lore is therefore earned by a process of discovery, and may require significant effort or cost or sacrifice. The stat block is a way of mechanizing the monster for play. Monster stat blocks remove the abstraction and mystery, and so they are metaknowledge, and not to be used as knowledge known by any ordinary character. In general, it is not within the spirit of the game to play your character using knowledge that you have that your character doesn't have, and is in effect cheating or spoiling the game as one might spoil the ending of a film for yourself or others. Players fear what they don't know. If fear and discovery would enhance a portion of your game, then the GM is encouraged to create their own monsters and to never use monsters as they are purely presented in the rules.

The reason why I would write a monster book for a TTRPG is so that I could write it with my desired premise built in. When you play a TTRPG such as D&D 5e for instance, it's fair to say that you can modify it however you want, but it's also fair to say that people have expectations for individual games, and when they're invited to play 5e, their expectation is to play with the 5e material as it is presented, and so they might be averse to any changes. The introduction to my monster book would be intended to prime my readers for my concept of monsters rather than theirs. If they agree to play their game using my monster book, they are agreeing to my premise, not theirs. I would explicitly address that my conception of monsters might be incompatible yours. If you try to seduce the dragon, it will automatically fail and for that turn, you will be vulnerable to the dragon meaning you don't benefit from your armor or saving throws.

Modernity Ruined Monsters

I perceive there to be a problem with monsters in modern media. I believe the word 'monster' should be reserved for something truly terrible or else we trivialize the word and diminish its meaning. In essence, I think that my culture has ruined the word by misusing it, and they've taken something away from us that we can't easily get back. Monster should be a word to describe something that is the mortal enemy of mankind, but is a word that can describe something that is so ugly it's kind of cute, something that's misunderstood and just needs a second chance, or it can be an ironic term as in a term of endearment. I don't know where this trend began. Was it Shrek? Was it Monsters Inc? Was it Boo Berry Cereal? Some other television program intended for a participation ribbon generation? I don't like it when a story promises me a monster and I get a something suitable for a Hannah Barbera cartoon. So as a rule, I will not use the word monster in vain. When I use the word monster, I want the audience to have a visceral reaction. I want the addition of only the word to a story to signal to the audience that there are stakes and they will be ugly.

Why do I care? I live in a time when there are very nasty, strong words that get repeated ad nauseam. Those words are fascist, racist, sexist, homophobe, etc. I don't want to diminish the meaning and severity of such words with overuse and misuse, and so I personally don't use these words unless I mean to. For example, I have heard that George R. R. Martin has said that the reason why he cannot finish his books is because of fascism, but I didn't read the news story about how storm troopers or myrmidons kicked in his front door and burned his rough draft and beat his hands with sticks so he couldn't write. I've heard people have defended Amazon's series The Rings of Power by describing fans of Lord of the Rings who are disappointed with the Amazon series as fascist for having expectations for Amazon to make a series that is faithful to the source material. But fans merely boycotted the series and gave it bad reviews at worst, they didn't show up at the studio and threaten to dispatch the producers with violence unless they re-wrote orcs like this and elves like that. These are flagrant misuses of the English language. People who do this are guilty of crying wolf, and if the day comes that they are eaten, they will have earned it. We should use these words to describe people who are truly bad. They should be reserved for people who truly meet the definition. I think people should have more respect for the words in our language, just as we don't scream help unless we are in serious or deadly danger. If you call everyone a fascist, there will come a day when people look at you like you're a misbehaved child then carry on with their day. Someone should sit you down with a history book and teach you what real fascism means.

Playing Dungeons & Dragons sucks and this is partly due to the other people who play the game who think that it's racist to treat all goblins as evil or who think that orcs are people too. The Great Cthulhu has plushies where he wears a cut little fez. Count Dracula had concubines and drank people's blood while they were still alive, but rip-offs of his likeness teach children their numbers on a tv show and market chocolate flavored cereal during the commercial breaks. Maybe my culture has been ruining monsters for longer than I realize. When I think of monsters, I think of Kentaro Miura's Berserk; Monsters don't get more horrifying than that. When I think about Berserk, I think about a story that doesn't pull its punches. When Berserk says monster, it delivers. The Firefly series had some villains called Reavers, and when characters in the show described Reavers, they didn't describe them as people, they didn't describe them as green, they didn't describe them as horned or winged or fanged or clawed. The Reavers were described as "they'll kill you, eat you, and rape you, and if you're luck, in that order." That is a horrifying opponent. That is a monster.

First, let's establish some rules. Definitional rules.
1. Monsters are always opponents. Monsters are not rivals or competitors or begrudging allies, they are always opponents. They oppose us. They are an enemy to humankind because they oppose us, and they oppose everything we believe in and everything we love. Not only are monsters just opponents, but they are our mortal enemies. The final boss for humanity to defeat will be a monster.
2. Monsters are deadly. They don't show mercy, and they don't spare people or let people live except to do more cruel things to them before killing them later. If you encounter a monster, it is kill or be killed, unless you can outrun it. Monsters ultimately cannot be reasoned with. They want death.
3. Monsters are destructive. Monsters do not and cannot live in balance with nature. They cannot find harmony with nature or other creatures. They are only destructive. They take. They cannot grow things, they cannot heal things, they cannot save things. We cannot live in a world with too many monsters.
4. The tone or mood of a story is always scary when monsters are involved. Monsters should be serious, not silly. There should be no light-heartedness, no jokes, and pretentious messages or sanctimonious morals of the day about how maybe humanity is the real monster (refer to my next rule). 
5. Monsters are not people. Monsters do not represent real-world or historic groups or individuals. Monsters represent things that go bump in the night, and they represent our deepest, darkest, and ancient fears, and they represent the things that we pray that a good god does not permit on Earth. I don't intend to humanize monsters in my stories, and I think humanizing monsters is one of the ways that modernity fails at monsters.

You'll notice that in my rules, I did not describe monsters as cruel or vile. I don't need to. You're probably already imagining something that is intrinsically cruel or vile. I also didn't need to describe them as ugly or filthy, but you might be imagining such a creature. I didn't describe monsters as things that lurk and stalk, and I didn't describe monsters as things with this kind of power or as lacking this kind of ability. I didn't describe them with this vice or that vice, with this weakness or that, or some flaw. or shortcoming. I tried to write these rules in such a way that the rules are clear, and that my intent or meanings would not be disputed or subject to interpretation. Vile and cruel are too colorful and perhaps not as clear as deadly, destructive, non-human, opponent who should be treated with severity.
Are there exceptions to these rules? Maybe there could be. But I caution that if you make exceptions to these rules, that you may no longer have monsters in your story or game. You may now have something that merely resembles a monster. A monster in name only is not a monster. Barney the Dinosaur is not a dinosaur because the creators made too many exceptions to the rules of what makes a dinosaur. If your expectation is tyrannosaurus-rex, maybe you should watch Jurassic Park instead, and we should have the conversation "is this intended to be a real dinosaur, or is this intended to resemble one?"

I suppose the point of all this is that I am an adult, and sometimes I want my monsters to be monsters, and there's nothing wrong with this. I think maybe society likes to infantilize and coddle people, or maybe people with a product to sell want to make sure it's suitable for a mass market for maximum profit. As a consequence, good monster stuff is really niche, and the niche creators who make it are more likely to be the types of creators who take it to eleven, but I'm happy with the dial set to eight or nine or ten. It's like our choices are either spooky scary skeletons for kids, monster girls for internet deviants, or gore-sploitation movies from a time before professional film studios had rules. The state of things sucks.