After being brutally humiliated by a wealthy heir and rejected by his girlfriend, Kael Mercer awakens an ancient Abyssal bloodline. Summoning the succubus queen Lilith, he gains immense dark power to exact ruthless revenge. Kael crushes his enemies' empire and exposes their sinister cult. Ultimately, he ascends as the true Dark Monarch, defeating a cosmic evil god to protect the city and rule alongside Lilith.