Master Emerald
The Master Emerald (マスターエメラルド[4] Masutā Emerarudo) is an object that appears in the Sonic the Hedgehog series. It is a massive green emerald and a mystical relic of great power that acts as a counter to the Chaos Emeralds, being the only force in the universe that possesses the ability to nullify and control their energies. This makes it a very powerful and valuable gem.
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. ...read more