In Dungeons & Dragons, few creatures beat the undead when it comes to both power and genuine evil. They are some of the strongest creatures in D&D, and adventurers have a hard time raising moral qualms about eliminating them. Undead can be found just about anywhere in a fantasy setting, but they add a special flavor to dungeons. More importantly, they can make an encounter unique.
Source：https://www.cbr.com/dnd-best-undead-creatures/
