Lazarus Pit

The Lazarus Pit is a fictional item featured in comic books published by DC Comics. They are associated with the Batman series of comic titles. Lazarus Pits are pools of mysterious liquid that have supernatural restorative properties. So named after the Biblical Lazarus, these pools of magical water can heal injuries, illnesses, regrow missing limbs, and even bring someone back from the point of death. An unfortunate side effect however, is that they also have a tendency to drive anyone who is exposed to the life-giving waters insane.