mehrunes' razor

Mehrunes' Razor, also known as The Dagger of the Final Wounds, Bane of the Righteous and Kingslayer, is a Daedric artifact found in The Elder Scrolls V: Skyrim. The dagger is one of the artifacts and namesakes of Mehrunes Dagon.
The unique enchantment grants the bearer a 1.98% chance to instantly kill almost any opponent.
https://elderscrolls.fandom.com/wiki/Mehrunes%27_Razor_(Skyrim)