Cannot die aura is a monster aura from the monster with the mod of the same name (displayed as Other Allies Cannot Die in the monster nameplate). Player need to kite the monster with the aura away from other monsters, or kill the monster with the aura directly, in order to kill the monster pack.
The aura effect display the descry symbol. The symbol represented Innocence or the Templar faction of in-game world.
Monsters with the "Allies Cannot Die" aura cannot be affected by the "Allies Cannot Die" aura themselves. This prevents multiple monsters with this aura from affecting one another.
Monster Balance Changes: The Allies Cannot Die aura and the Allies Deal Substantial Extra Physical Damage auras now first appear at level 12 and 8 respectively.