Chaos Emeralds, Sonic Nexus Wiki

The Chaos Emeralds are objects originally from Sonic's World. They are each filled with limitless power, enabling one to empower themselves, power machinery or warp time and space. Their misuse at the hands of Doctor Eggman caused the Nexus to open up, setting up the events of Sonic Nexus.

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Sonic the Continuation Reviews Newbie's Perspective: – CrystalMaiden77