Revenant

Revenants were a type of undead.

In one universe, the Vampire King's lair was guarded by two revenants, whom Fiona slew when she, Jenny and Kim took on the King. She stabbed one through the ribcage with her sword, and simply tore the other one to pieces in her lupine form. (PROSE: Camera Shy)

According to Laura Drake, the Beastmaster was a revenant, making him functionally indestructible. (COMIC: Jenny Everywhere and the Master of Monsters)