Amulet of Balance
It is written that this Amulet is worn by the Champion of Balance. Wearing it and then using a Serpent Gate will teleport the Avatar and the party 400 years into the past. Normally, the Amulet would need a week to charge, but with the Silver Seed planted, resulting in the Tree of Balance, the Amulet can be used at any time desired to travel into the past and back to present.
Karnax gave the Amulet to the Avatar during their meeting on Monk Isle, believing it was the hero's place to be the Champion of Balance. The Avatar mastered the challenges in the past, effectively saving the world from destruction in the War of Imbalance. It was only thanks to this amulet that the inhabitant's of Serpent's Fang stayed friendly towards the Avatar.