Based on the tabletop role-playing game Dungeons & Dragons.
A small adventuring party investigates a series of disappearances near a narrow cave. They soon uncover an ancient dwarven city filled with an army of elven ghosts. Deciding to risk it all in hopes of lifting an ancient curse, they descend the dark ruins. Time is running out as a hateful, necromantic force lays in wait for them. Recorded through the eyes of their romantic, showboating swordsman, their journey grows more dire the deeper they descend.