Crystal dagger

The Crystal Dagger is an item seen in the film Princess Mononoke. It is not used as a weapon.

Kaya gives the item to Ashitaka before he leaves his village. Later on in the story, Ashitaka gives it to San. It is used to show the bond between two people. Kaya gives it to Ashitaka, as a way of saying that she will wait for him and she loves him.