Steel Skin is a prayer that temporarily boosts a player's Defence skill by 6 levels when calculating block chance. It cannot be used in conjunction with any of the other prayers that provide a defence bonus. Once unlocked, Steel Skin replaces Rock Skin. It is the best defensive prayer available for Free players and is the fourteenth prayer to which players have access. Members' Chivalry and Piety both offer better defensive enhancements, however. It is often used until the Protection Prayers are available.