The mithril defender is a defender made of mithril and is obtained by killing cyclopes in the Warriors' Guild. Players must already be in possession of the black defender in order to receive the mithril defender. As with all mithril equipment, the mithril defender is the lightest of defenders. It requires 20 Attack and Defence to wield.
If the player dies below level 20 Wilderness, it will remain in the player's inventory. However, the item will be unusable and must be repaired with 15,000 coins by using the item on Perdu.