You can banish 1 Subterror monster from your Graveyard; for the rest of this turn, face-down monsters you control cannot be destroyed by card effects, and your opponent cannot target them with card effects. If this card on the field is destroyed by a card effect: You can add 1 Subterror monster from your Deck to your hand. You can banish this card from your Graveyard, then target 1 Subterror monster you control; change it to face-down Defense Position.