The Undead Units category features the following heroes: 
Skull Knight, Bone Collector, Spectral Samurai, Deadshot, Necromancer, Dusk, Skullshot, JeromeASF, The Dark King, King Bones, King Revenant, Death Thorn, Detective Skully, The Count, Vampire Queen, Vampire King, Frank, Toxic Frank, Skele Frank, SGT Frank, Demon Frank, Holy Frank, Shadow Frank, Crazy Frank, Toxic Bunny, Sethos, The Pharoah, Anubis, Bastet, Sobek, Amun-Ra, Mau, Him, Revenant Raider, Gold Bones, Darkreaver, Slasher.