Originally Posted by
Kish
There is no obligation for the DM to throw random undead encounters at PCs, and certainly no rule that states every campaign world is equally undead-heavy.
That said, I have never gotten the impression that undead are rare in the OotS universe. Xykon the living sorcerer had never heard of a lich when Redcloak mentioned them, but no one in the Order went, "Wait, a what?" when Elan called Xykon a mad lich.
I never understand when people assert that magic should be more restricted than technology.