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- You may be looking for the Master Emerald of Mobius.
The Master Emerald is a magical gemstone connected with the Chaos Emeralds that keeps Angel Island afloat and is protected by Knuckles the Echidna.
History[]
Sonic offers Knuckles to run with him for a bit but he retorts that he couldn't leave Angel Island since he was keeping the Master Emerald, but Sonic tells him that it was stupid, because it wouldn't be going nowhere, since it's an Emerald, but Knuckles still refused. (SX: #1)