Banshee 20
Death Knight 12 - I'll jump on this hate train.
Ghast 16
Ghost 20
Ghoul 21
Lich 21 - the ultimate BBEG; even if the players kill them accidentally, they just keep coming back
Mummy 22
Revenant 18
Skeleton 21
Shadow 20
Specter 20
Vampire 20
Wight 21
Wraith 21
Zombie 20
- Zynx, from the EN World mobile app