Half of a Key

Half of a Key (Loop, Tooth)
Half of a Key is an item sought after by most adventurers, due to it's ability to be able to be forged into the Crystal Key. Slayer Monsters are known to drop these, as well as the Skeletons near the wilderness ditch. Monsters drop Loops and Teeth, then a player must combine these two to forge a full Crystal Key (no skills are required to do this). The key can then be used on the Crystal Chest, which can yield money as well as gloves and whips. See its respective page for a full list of drops.