Argonaught - The Skeleton Key (Dungeon Synth, Dark Fantasy)

Bandcamp: argonaught.bandcamp.com/album/dark-halls

In the darkest shadow of the deepest pit, there lies a door no eye can see. The way is shut to the living. Bones rattle and shake. The dead rise. To pass, one must enter the realm of darkness and fetch the skeleton key from the hand of Death himself.