Items required: Combat equipment * Enter the monastery and defeat Barrelchest. * You must wear your fishbowl helmet and diving apparatus. * Each attack will disable your prayer and remove a few prayer points. * When adjacent he will only attack with melee. * Re-enabling prayer after each attack will prevent you from taking any damage. * Alternatively you can leave the monastery and re-enter; the boss will get stuck and can be safespotted from the entrance. * Talk to Brother Tranquility.