Areth

Former Archduke of Hell and terror of the Core. For millennia he cause stagnation and decline through the core by using the power he stole from Itoa and Aoti to build his own power by invading other planets and reaping the souls of his victims. He perfected his world with the invisible invasion of Twilight World by convincing the natives of Amet to worship him as their God of the Sun and Order. Under his direction they spread their religion across the world by conversion and genocide. When the time was right he tricked them into binding his high temple to their sun and creating a portal directly into Hell starting Nightfall on the shadow side of the world. The resulting apocalypse killed millions of his most fervent followers, creating a nearly infinite army of Devils with which he set out to conquer other worlds, including Goblin World and eventually the rest of Itoa. Primarily due to interference by The Travelers his schemes did not go according to plan, forcing him to spring an assault against all of his enemies at the same time before he was ready,  The Travelers used this moment of weakness to destroy him in what has since been called The Reckoning.