Hildir's Brass Key Valheim 1.0.20
Hildir's Brass Key is a miscellaneous found in the Black Forest biome in Valheim.
“It seems to be missing its owner...”
Hildir's Brass Key is a Miscellaneous item. Its in-game description reads: "It seems to be missing its owner..." The key has a weight of 0.1 and has no effects of its own.
Hildir's Brass Key can be teleported, so it can travel with you when you are teleported. In short, it is a Miscellaneous item weighing 0.1 that the game describes as seeming to be missing its owner.
Other miscellaneous items
Ancient Seed, 
Asksvin Egg, 
Asksvin Saddle, 
Barber Kit, 
Barley Flour, 
Barrel Hoops, 
Bell, 
Dragon Egg, 
Dragon Tear, 
Egg, 
Fuling Totem, 
Hildir's Brass Chest.