Red Dragon Archfiend
① After Damage Calculation, if this card attacks an opponent's Defense Position monster:
Destroy all their Defense Position monsters.
② During your End Phase:
Destroy all other monsters you control that did not declare an attack this turn
(Activate & Resolve only if face-up on the field).
● The ① effect activates before Flips, or effects like “D.D. Warrior” or Giant Rat” can activate.
(A Flip Effect monster's effect will activate on a new chain after it is destroyed. The others listed here don’t.)