gottsch's Monster Manual (GMM)

The shared monster library behind gottsch's dungeon mods.

GMM doesn't add anything to your world by itself. It's a base-class library — a shared collection of mob classes, AI goals, models, renderers, and textures that other mods build their monsters on top of. If you have a mod like Dungeon Denizens v2+ installed, GMM is the engine running underneath it.

How it works

Vanilla monster code isn't built to be shared across mods. Every mod usually reinvents its own flying AI, its own spell-casting goals, its own summon logic — even when the mobs behave almost identically. GMM fixes that by pulling the reusable parts out into one place.

GMM registers zero entities, items, or blocks of its own. It only supplies:

• Base mob classes (GMMMonster, GMMFlyingMonster, WingedHumanoid, and family-specific bases like BowSkeleton and Beholderkin)
• Reusable AI goals (ranged/thrown-projectile attacks, spell casting, mob summoning, ally alerts, volant flight & landing, shield blocking, thrall/ownership orders)
• Shared models, renderers, and textures
• A datapack-driven config system for tuning spawn gating and mob behavior without touching code

Consuming mods (Dungeon Denizens, and future gottsch dungeon mods) register their own EntityTypes that point at GMM's classes, and reuse GMM's assets. When two mods need the same monster behavior, they share one implementation instead of maintaining two.

What's inside

GMM currently provides base classes and assets for a growing roster of D&D-flavored monsters — oozes, zombies, undead, beholder-kin, orcs, constructs, and more.

📖 Full mob roster, lore, and screenshots: see the GitHub Wiki for a per-mob breakdown of every family GMM ships.

Every family shares its behavior through the same base classes, so a bug fix or improvement in GMM benefits every mod built on it at once.

For modpack makers

Mob spawn gating and many behavior values (timings, probabilities, despawn rules, etc.) are data-driven, not hardcoded. Consuming mods ship JSON under data/<namespace>/gmm/mob_config/<name>.json, and you can override any of it with your own datapack:

{
  "spawn": { "enabled": true, "minHeight": 0, "maxHeight": 255 },
  "properties": { "rangedProbability": 0.5 },
  "flags": { "someToggle": true }
}

Edit the JSON and run /reload — changes apply the next time a mob spawns. No recompiling, no mixins. See the Mob Config Reference for every key each mob reads, its default, and what it controls.

You can also customize what GMM's monsters wield, eat, and respond to through its tag system — see the Tags Reference for the full list (weapon/armor pools, ghoul food, ally alerts) and copy-paste datapack examples.

For developers

GMM exists so mods don't have to duplicate AI and rendering code. If you're building a mod that wants gottsch-style monsters:

• Depend on GMM and register your own EntityTypes pointing at its base classes
• Contribute equipment, allies, and summon targets through GMM's tag system (gmm:-namespaced entity-type and item tags) instead of hardcoding cross-mod references — see the Tags Reference
• Reuse GMM's models/renderers/textures, or extend its base classes for your own variants

GMM never references a consumer mod's classes — all cross-mod coupling flows through tags, datapack config, or a small set of static hook points that consumers wire up (e.g. a mob's projectile launcher or ambient sound).

Compatibility

• ✅ Adds no new content by itself — installing GMM alone changes nothing in your world
• ✅ Required by any mod that depends on it (check that mod's page for the specific dependency)
• ✅ Behavior/spawn tuning is datapack-driven, so modpacks can retune monsters without a code change

Companion mods

GMM is required by:

• Dungeon Denizens — the full roster of dungeon monsters, spawning in your world

License

Licensed under the GNU Lesser General Public License (LGPL). Source available on GitHub.