If a monster(s) that was Special Summoned from the Extra Deck is destroyed by card effect (except during the Damage Step): You can target 1 of them; each player takes damage equal to half its ATK. When your DARK Synchro Monster Special Summoned from the Extra Deck is targeted for an attack: You can target 1 card on the field; destroy it. You can only use each effect of "Earthbound Resonance" once per turn.