All other "Ancient Warriors" monsters you control cannot be destroyed by battle. You can only use each of the following effects of "Ancient Warriors - Fearsome Zhang Yuan" once per turn. • At the start of the Damage Step, when your "Ancient Warriors" monster battles an opponent's face-up monster: You can Special Summon this card from your hand, and if you do, that opponent's monster loses 1000 ATK. • If a card(s) your opponent controls is destroyed by battle or card effect: You can target 1 card your opponent controls; destroy it.