Royal torsion spring

A royal torsion spring is one of the items used to upgrade the coral crossbow to a royal crossbow. It is exclusively available as a drop from the Queen Black Dragon.

To upgrade the coral crossbow into the royal crossbow, along with a royal torsion spring, you will also need:
 * Royal bolt stabiliser
 * Royal frame
 * Royal sight

It can also be used on an existing royal crossbow to repair it by 25%.