SRD5:Nine Lives Stealer
|This material from the 5th edition SRD is published under the OGL|
Nine Lives Stealer
Magic Weapon, (any sword), very rare (requires attunement)
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.