Hildir's Silver Key Valheim 1.0.20
Hildir's Silver Key is a miscellaneous found in the Mountains biome in Valheim.
“It seems to be missing its owner...”
Hildir's Silver Key is a Miscellaneous item. Its in-game description reads "It seems to be missing its owner...", which suggests a key that belongs to someone else.
The key has a weight of 0.1, so it is a very light item to carry. It can be teleported, which means it can travel with you when you teleport and does not have to be left behind.
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.