Misc
Hildir's Brass Key
It seems to be missing its owner...
Hildir's Brass Key is in the game files, but a normal game never gives it out. The only chest that holds it is a separate key chest that is never placed in a world, and Hildir unlocks her returned chests herself: bring her 
Brass Chest back from the Smouldering Tomb and its stock goes on sale. The key can only be spawned with console commands.
Spawn command
With devcommands enabled, this drops Hildir's Brass Key at your feet. The ID is case sensitive; the last number is the amount.
Item ID: HildirKey_forestcrypt · see the spawn command or all console commands and IDs