Calling all the Monsters {MCD X Reader}

"Huh? W-what? Where am I?" ~•~•~•~•~•~ (Y/N) woke up in the ruins. Looking deserted and abandoned, of course. She survived for 5 years without anyone, and became a highly trained assassin. Turned 18, she was summoned by Irene, the Lady herself, to her own dimension. There, (Y/N) figured out her hidden powers, and got...