The Lazarus Pit is a mysterious pit of eldritch waters with the power to restore life and heal life-threatening injuries.
The exact origin of the Lazarus Pits are unknown but they have existed for thouasands of years. The man known as Ra's al Ghul was first exposed to the pits in Arabia, 125 A.D. After being killed on the battle field, a traveller took him to a pit and brought him back to life. Since then it has given him the ability to live far beyond that of any normal mortal, over 2000 years. It has also given him time to build his secret global organisation, the League of Shadows.