Writing Rules

Each rule is a line of fields separated by |.

• * means "all". Use it in place of a mob ID to apply a rule to every mob, and in place of an item, dimension or biome where noted. * never includes players; add a minecraft:player line if you want to affect them too.
• Entity IDs can also be a tag or a whole mod. #c:bosses targets an entity type tag, and modid:* targets every mob registered by that mod.
• Optional fields can be left out. Leave them off the end of a line, or write ? to skip one and set a later field. Dimensions and biomes default to all of them.
• The namespace is optional for vanilla. IDs without one use minecraft, so zombie and minecraft:zombie are the same. Modded IDs still need theirs.
• Precedence differs by rule type. Mob Stats and Behavior's attributeOverrides, damageModifiers and experienceModifiers, plus despawnRanges, use "narrowest wins": a specific mob ID beats a tag, which beats modid:*, which beats *, and a per-dimension line beats an every-dimension line for the same mob. Custom Mob Drops and Custom Mob Spawning rules instead apply every matching line.

See Configuration Reference for the full field format of every setting.