Simulacrum (rune effect)

Are you looking for the Wizard skill Simulacrum?

Lethal Decoy is a Spirit Spending Monk skill unlocked at Level 8.

An Alabaster Rune placed in it will alter the skill in the following way.

[e]

If you die while the decoy is alive, you are resurrected at the decoy's location with 100% Life. The decoy no longer attracts enemies and the duration is increased to 26 seconds.