OK I see, yeah by Undead I always refer to the body type and not faction, since faction can be anything and can have any type of mobs of it
Basically what I am saying that body type of a mob should be irrelevant to the rule.
If mob is KOS (by faction) and has the Always Aggro FLAG - it always aggros.
So it can be NON Undead and always aggro
Or it can Undead and don't aggro (because of level difference)
Just to be clear