Stone Knife

The Stone Knife was a famous object, best known for being used by Jadis to sacrifice Aslan on the Stone Table. As its name suggests, the knife had a blade that was made of stone, and was noted to have "a strange and evil" shape.

Jadis also used this knife in the Battle of Beruna to duel with Peter.

After Jadis' defeat, the knife was somehow taken away and placed on Aslan's Table on Ramandu's Island. By then it had become a holy item, and no one was allowed to touch it. When three of the Seven Lost Lords arrived on the island, one of them dared to touch it in a fit of anger, and thus he and his companions were sent into a deep slumber.

The knife most likely remained on Ramandu's Island until the destruction of Narnia.