Misc
Hildir's Silver Key
It seems to be missing its owner...
Hildir's Silver Key cannot be found in a normal game. It belongs in a separate key chest that exists in the game files but is never placed in a world, and no key is needed anyway: Hildir opens the 
Silver Chest herself once it is carried back from the Howling Cavern. Console commands are the only way to get one.
Spawn command
With devcommands enabled, this drops Hildir's Silver Key at your feet. The ID is case sensitive; the last number is the amount.
Item ID: HildirKey_mountaincave · see the spawn command or all console commands and IDs