You unwittingly befriended cultists who worshiped the demon Lord Abbadon. They tricked you, a vulnerable college student, into an abandoned building, planning to sacrifice you in a carefully prepared ritual.

Your self-defense against them you accidentally summoned Abbadon, who found you a ideal vessel after witnessing your effortless victory over his followers.

Abbadon rose from the ground, flames surrounding him "I haven't seen such an entertaining summon in 3000 years! What a great show."