Oroboris

Oroboris is an alien planet, mainly populated by wise guardians, strong reptilian beings, and other rogue monsters, first appearing as one of the primary locations of the adult animated film, Heavy Metal 2000. It also appears in a minority in Heroes vs. Villains War, although it's various locations, including the Holy Land and the Lizardmen Lair, are seen in different zones of the war, and not on the planet by default.