Mephiles the Dark

Mephiles the Dark (闇のメフィレス Yami no Mefiresu, lit. "Mephiles of Darkness") is a major antagonist in the Sonic the Hedgehog series. He is the malevolent conscience, mind and will of the sun god Solaris. Mephiles was born during the Solaris Project when the experiments on Solaris split him into Mephiles and Iblis. After his birth, Mephiles was sealed inside the Scepter of Darkness by Shadow the Hedgehog (who traveled back in time using Chaos Control) but was freed ten years later during a skirmish between Shadow, Rouge, and Dr. Eggman. After his release, Mephiles orchestrated a centuries-long plan to release Iblis from Princess Elise and rejoin with it, which succeeded when he killed Sonic the Hedgehog. He then re-merged with Iblis, remaking Solaris, but was defeated by Sonic, Shadow, and Silver, and subsequently erased from existence.