The premise of this blog is that evolved creatures know how to use the abilities they were born with. The interesting thing about undead creatures, in this context, is that they’re not evolved creatures—at least, not anymore. The transformation to undead status doesn’t entirely erase what a ghost or zombie was in its previous life, nor does it necessarily come with a set of survival rules that any and every undead creature will adopt. Undeath is a curse, and as such, it creates what I think of as compulsions. That is, whatever spell, influence or event caused a creature to rise from the dead also drives that creature to behave in ways that have nothing to do with its own self-preservation. In fact, since the creature has already experienced death, the concept of “survival” is essentially meaningless to that creature. Consequently, how badly an undead creature is injured has nothing to do with whether it will flee, and the tactics it uses will have less to do with how to effectively guarantee its continued existence and more to do with the particular compulsion that drives it.