1. Travel to Volcano Island and talk with Hatsu. You need to finish Volcano Island Access Quest to be able to travel. 2. Deactivate 15 crystals around the volcano to reduce the heat. You can see the first one in a room to the right of Hatsu. 3. Go back and talk with Hatsu. 4. Kill 300 Lava Devourers. 5. Report back to Hatsu. 6. Travel through the Way of Fire and meet with Suimitsu. Dodge the fire attacks unless you want to die! 7. Bring magma stone so that Suimitsu can figure a way to fight the heat! 8. Kill 300 Lava Golems! 9. Bring frozen crystal, it should be strong enough to lower the temperature. 10. Kill Volcanus - the lord of the Volcano. 11. Go back to Suimitsu.