Eberron: An Age to Come
Queen of Death
Undead for perhaps thousands of years, Erandis is rumored to be the last recipient of the Mark of Death. It is also rumored that she is a half-breed of dragon and elf.
Erandis claims dominion over the undead and is the undisputed, though publicly unknown, leader of the Blood of Vol religion.
No one has seen Erandis in over 2,000 years, even the PCs have only seen a visage of her.
While her goals are unclear, she appears to be constructing an Eldritch Machine to remove her lich-state and bring her back to life… should this happen she’d have power to rival a god.