During either player s turn, when your opponent activates a card or effect: You can send this card from your hand or field to the Graveyard, then target 1 Subterror monster you control; negate the activation, then change the targeted monster to face-down Defense Position. You can target 1 face-up monster you control; change it to face-down Defense Position, and if you do, Special Summon 1 Subterror monster from your hand or Graveyard, in face-up or face-down Defense Position. You can only use each effect of Subterror Fiendess once per turn.