MobDef
A custom mob, drawn as a vanilla entity. Refused on a server that draws no creator mobs.
Fields
mobDef.look: string#The entity it looks like, which must name minecraft:. a minecraft: entity type
mobDef.health: number#Health, above 0.
mobDef.attributes: { [string]: number }?#Attribute values by attribute key. A bare key resolves to this experience, so write vanilla attributes as minecraft:<name>.
mobDef.persistent: boolean?#Whether it is saved with the chunk and comes back when the chunk loads again; default true.