Wondrous Item, legendary
A golden hourglass filled with silver sand hangs at the side of the wielder. When an enemy is beaten to zero hit points and returns to above 1 hit point, then you roll 1d20, what ever is the result is how many turns it takes for the enemy to die permanently. This hourglass can only be used by Death and can be summoned to Death's hand as a reaction.
Notes: Control, Utility