The New Mutants

It revolves around five young mutants who are just discovering their abilities being held in a secret facility against their will. When they learn of what secrets this certain facility has, they must fight to escape their past sins and save themselves. As they relive their origin stories, their memories turn into terrifying realities. Soon, they question what is real and what isn't, and it becomes clear that the institution isn’t what it seems.

Example of:
Superhero Horror