Different monster types - undead, summoned etc

[Drawde]

Many spells in EQ only work against certain creature types, eg Ward Undead, Defoliate, Charm Animal etc.
In EQEmu these spells don't work since mobs don't have the flag indicating which type they are, so they
aren't considered a valid target. Is the packet/memory location for this flag known? If so it could be added
as a value in npc_types.
As far as I know the types are Normal,Animal,Plant,Undead and Summoned/Pet. Necromancer/SK pets are considered Undead
rather than Summoned I think (pet buffs say "this spell only works on undead")