Elixir of Lazarus

Origin
The Elixir of Lazarus was created by Lazarus when in an attempt to live forever after the death of his parents. The successful form came after thousands of attempts that killed dozens of people. Once the completed form was made, Lazarus drank it shortly before meeting with Jesus, which resulted in them fighting and eventually Lazarus dying, taking the recipe with him.

Function
The Elixir, once drunk, instills immortality upon the drinker. The immortality comes in the form of instant recovery from any attack, healing as the attack passes. This also applies to any health or aging. The immortality can only be bypassed with sufficient amounts of pure energy, such as attacks from angels.