Tsuihousareta Renkinjutsushi-san, Saikyou no Dungeon wo Tsukurimasenka?

Rick, an alchemist who was banished from the strongest heroes' party, is wandering the wilds alone, when he saves a beautiful woman. It turns out that she is a dungeon spirit! Rick makes a contract with her and becomes the dungeon master. Now he is determined to create a dungeon that will defeat all the heroes! Source: MU