The Sword of Zork is a magical weapon that has a will on its own.
Somehow it found its way to Earth where it was discovered by Bill and June under a bush near their school; they noticed that it had elven craftmanship and reminded them a sword in a story they read earlier in school. Once they touched it, they heard an explosion and a light engulfed them, and transported them to the Kingdom of Zork.
When they encountered a Troll, the Sword glowed in a blue hue and it somehow guided Bivotar into fighting him, and successfully pierced his side. Later a Gnome offered to help them cross a gap but asked for the Sword as his reward, despite being impressed hearing that it belonged to their uncle, Syovar. Bivotar however was able to cheat the gnome and cross the gap without losing the Sword.
When they returned to the White House, they delivered the Palantirs and the Sword to Syovar. They started to battle the forces of Krill, and as Syovar rode he held the Sword high overhead, its brilliant glow like a beacon to his troops. With it he duelled Krill who challenged him.
Krill managed to drop Syovar down and was prepared to strike his fatal blow. With a crackle of energy, a blue glow surrounded the Sword of Zork and Syovar's right arm. With surprising strength, Syovar blocked Krill's strike, pushing him back, stunned, allowing Syovar to plunge the blade into his heart. Krill's body disappeared in a puff of smoke.