I have heard of this weapon only in story. Created and forged of gold, it is a mystical weapon of Tibetan folklore that was lost in a mountainous area during a great battle. They called it the War Cannon. Rumor has it that the person that holds this weapon must be pure of heart for it to function correctly.

I seem to be able to discharge some sort of cold sphere out of it. I wonder if it can slow down these bastard creatures...

The Tibetan War Cannon is a weapon found early in the game.

It is acquired by venturing into Oneiros while searching for the Garden Key in Otto Keisinger's room.