Nine Lives Stealer

From Dungeon Master's Guide, page 183. Found on Magic Item Table H.

Description
Weapon (any sword), very rare (requires attunement).

You gain a +2 bonus to attack and damage rolls made with this magic weapon.

The sword has 1d8+1 charges. If you score a critical hit against a creature that has fewer than 100 hit points, it must succeed on a DC 15 Constitution saving throw or be slain instantly as the sword tears its life force from its body (a construct or an undead is immune). The sword loses 1 charge if the creature is slain. When the sword has no charges remaining, it loses this property.