Master Emerald

The Master Emerald rests on Angel Island, usually in the Altar of Emerald, where its power keeps the island afloat in the sky; without it, the island will fall down. It also served as the prison for Chaos and Tikal, until the both of them were released in recent times. Over the last three millennia, the Master Emerald has been guarded by the surviving members of the Knuckles Clan in order to keep the tragedies that it has been involved in from ever repeating themselves. In the present day, its current guardian is Knuckles the Echidna