This week, it's a giant sword for a giant man...He-Man's Power Sword! Skeletor better be worried. The Power Sword is a fictional sword from the Masters of the Universe toyline, sometimes also referred to as the Sword of Power and the Sword of Grayskull. It started out as a mystical object in the early stories, in which Skeletor tries to obtain both halves and put them together in order to gain control over Castle Greyskull, while He-Man's role is to stop him by using more regular weapons such as an axe and a shield.