Dungeon Lord in Another World

Li Xi is accidentally summoned by a lich from a multiverse to the Abyssal Purgatory, where he is forced to become the lich's apprentice and slave. After the lich dies unexpectedly, he makes off with most of the treasures in the magic tower and escapes to Black Sun City. Later, he even buys a territory on the New Continent, and thus begins his legendary career as a lord.

Whether you're a demon or a righteous warrior, anyone who gets in his way will be swept into the trash heap. The dungeon's prison is where you belong.