A bestial, werewolf-like form of Sonic the Hedgehog, this extreme physical transformation was created when Sonic accidentally absorbed a dose of Dark Gaia's energy, although the transformation itself would only be triggered by nighttime and remain active until daytime. After using it on a number of occasions, Sonic lost this form permanently when Dark Gaia reclaimed the energy that caused the transformation. (Image created by Kazushi on e621)

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