Undead is a subtype of monsters, one of many, and monsters can fit under multiple subtypes. This will make things extremely confusing later on.

The categories should be Monsters, Mini-bosses, Bosses, and Greater Beings (for now).

I'll sit back on this and then judge everything once it's done, unless someone requests me.

I was thinking of subtype like husks being a subtype of zombie.

What about passive mobs?

Passive mobs aren't monsters are they? I guess I could ask CK about what they might go under

There is the undead subtype, the Ooze subtype, can't think of any more confirmed ones

I'll save off updating passive mobs until later.