The person identifies himself as an elf called Virion. He has been trapped here for quite some time, not knowing how long it has been. His kind of elf can live long, long times without basic needs.

He says that the demons here are gathering different people to exchange them for stronger demons from the 'Hell Dimension'. Many of his kin and others have been sacrificed for them. He's uncertain why he's still here and alive.

The lock can be easily picked. Virion might need a little help to get outside, because while he can survive without much anything, he still gets weak.