It reminds me of the sacrificial knives used by the Aztecs.

I am godspeaker of the Sacrifice chamber, responsible for the sacrificial knives.

He held the sacrificial knife ready to strike whoever might come within its reach; but none came.

Three times he raised and lowered the sacrificial knife above the prostrate Gregory.

The sacrificial knife lay upon the altar where it had fallen from the dead fingers of Obergatz.

Tradition says that she often returns there to weep for her lost son, only to find a sacrificial knife.

Strapped to his waist was the sacrificial knife with its gold hilt.

He swung the sacrificial knife high above his head.

Perhaps I myself shall wield the sacrificial knife that drinks your blood.

He drew the sacrificial knife from his belt, and plunged it into the ground.