A legendary sword
Annihilus is a legendary sword supposed to kill anyone it strikes in combat. It belonged to the infamous half-orc villain Graglos Mar, a pirate and raider who lived in the area about 200 years ago. He made Highport his home, but he raided all the coasts along the Wooly Bay. While Graglos was certainly real, the magical properties of his sword were probably exaggerated.