Coral bolts are ammunition for the coral crossbow. They can be received as a common drop from young grotworms found on the first floor of the Grotworm Lair, the dungeon visited in Song from the Depths. 50 are also received as a reward for the quest along with the crossbow. These are the only bolts that can be used with a Coral crossbow. In addition they can only be used with the coral crossbow; they cannot be used with any other crossbow, not even the royal crossbow.