Lazarus Pit

History
Lazarus Pit is an artifact,a pond of water which can bring back youth and dead back to life - but at a cost of ones sanity. They can give prophetic visions.

Lazarus Pits can loose its healing powers. If left for a long time, waters of a broken Pit can change someone into a monster (see Matt Hagen).

Trivia

 * Gerhardt Gestern seems to be the only person.who knows how to "repair" a Lazarus Pit.
 * It gave Nyssa al Ghul a part of Anti-Life Equation.
 * It revealed to Edward Nygma identity of Batman.