Impire

Developed by Cyanide in Montreal, Impire tells the sordid tale of Baal-Abaddon, a once-mighty horror from the Bottomless Pit, who finds himself summoned by the incompetent sorcerer, Oscar van Fairweather, and trapped in the form of a laughable imp. Using their cunning and an array of devious tricks, players will help the demon lord break free, rebuild his proper hell-spawn body, and construct an impressive dungeon to form the seat of his new kingdom. Players will have to design, develop, and defend their demonic dungeon from would-be do-gooders in order to expand and triumph.

Source: TheGamesDB