Knife of Kirom

The Knife of Kirom was a legendary Klingon artifact that was over a thousand years old and had an important place within the Klingon Empire as it was stained with the blood of Kahless the Unforgettable. Due to this, it was kept within a sacred vault on Qo'noS where no one was allowed to enter.

Gowron, the Chancellor of the High Council of the Klingon Empire, used the Knife of Kirom to run a genetic analysis on the clone of Kahless in 2369.

(TNG episode: Rightful Heir)