Key

"Because even in some random caverns there will be locks" -Geo

Keys are obtained by finding them or buying them at dungeon shops. They have a chance of 2 to generate in dungeons, and a chance of 2 to generate in shops, and cost 10 Coins. They are used to unlock locked doors, to use them you need to stand near a locked door and drop the lock item next to the brown book in your inventory.