Eggman Upgrades Metal Sonic

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The Master Emerald is a mystical green gem of great power. It currently rests on Angel Island, with its mysterious power being what keeps the island afloat in the sky.

The emerald is usually guarded by Knuckles the Echidna, the island’s sole resident. However Knuckles was forced to leave his post to command the Resistance, leaving the gem vulnerable. (StH: #3)