Fenrir's Dungeon

Have you heard anything about the Scandinavian gods? Many sought evidence of their existence, but only a few were able to return to tell about the distant mysterious island of Lingvi. Like the possessed ones, they spoke of something they saw there, deep underground. Something... Or, perhaps, someone? No one knows, because soon they also disappeared, leaving behind fragments of legends about Fenrir. You gathered a group of friends and decided to go to this island... You woke up in a dark dungeon, you hear footsteps, someone is nearby, there is no escape...