Chaos Knuckles is a transformation in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It was a natural evolution achieved by Knuckles the Echidna in the universe of Dark Mobius.
Chaos Knuckles' early history was most likely largely the same as his Mobius Prime counterpart's. The point of divergence was when Knuckles began thinking differently of the events after blocking a shot at Dimitri in this form. Unlike his Prime Zone self, this version of Knuckles never returned to his normal form, instead retaining all his powers. Using this strength, he eventually defeated Dr. Eggman, but ended up becoming the villainous Dark Enerjak. Chaos Knuckles later lost his powers when Jani-Ca drained them from him with the Sword of Acorns.