Abyss Lava is found in the Abyss of Demons. Abyss Lava surrounds the boss room and also surrounds very narrow paths that must be navigated in order to reach to boss room. Despite the difficult enemies that inhabit the dungeon, the deaths of many players are due to the lava that fills the dungeon.
Abyss Lava does 60 armor piercing damage and reduces the players speed to 67% of their normal speed.