Here's a few off the top of my head:
Alderin the Crafter of Ash
Eris the Mighty Dracolich
Secrest the Sea Hag
Roven the Warrior of Old
Arias the Shadow Whisperer
Mayvre the Undead Queen
Aralys the Swamp King
The Terrible Three, Aluka, Xyre and Vectara.
Morsa the Duskwalker
Akobel the Banshee
Uris the Ghostly Omen