To Special Summon Hamon, Lord of Striking Thunder using its own procedure, you can also use face-down Spells you control. Once per turn, while you control an Attack Position Hamon, Lord of Striking Thunder , you can negate any Spell Trap effect activated by your opponent, then, change 1 Hamon, Lord of Striking Thunder you control to Defense Position. If a face-up Uria, Lord of Searing Flames , Hamon, Lord of Striking Thunder , or Raviel, Lord of Phantasms you control leaves the field: You take no damage this turn.