Totem of Undying

Totems of Undying are upcoming items in 1.11.

As a drop from mobs
Totems of Undying are dropped by Evokers upon death.

Usage
Totems of Undying will provide the player with regeneration and absorption status effects upon receiving fatal damage, only if the player is holding it in either their main or off-hand slots.
 * Totems of Undying do not save the player from death caused by the command, or void damage.