Start the battle with the Stygian (Ashlands Boss) by killing phantom guard soldiers while riding Ruin. Equip Combat Lore to increase the experience received from each strike and Bloodthirt to restore your health. Once the Stygian frees itself, ride alongside it, and attack its body, but do not hit the helmet or the Stygian will attack you. The Stygian will disappear under the sand and resurface. Repeat the process to increase your Chaoseater Blade level. If the Stygian attacks, ride Ruin to the closed doorway during the battle to jump off and have control of Ruin. Keep your back against the door, and wait for the Stygian to charge at you. You will get knocked through the door and can return to Vulgrim to reset the battle.