During the turn they were Normal or Special Summoned, your opponent cannot target "Ancient Gear" monsters you control with card effects, and they cannot be destroyed by your opponent's card effects. Your opponent cannot activate cards or effects in response to the activation of "Ancient Gear" cards and effects. If this card is destroyed in the Spell & Trap Zone: You can Special Summon 1 "Ancient Gear" monster from your hand or Graveyard, also you cannot Special Summon monsters for the rest of this turn, except "Ancient Gear" monsters.
![Ancient Gear Fortress [Structure Deck: Machine Reactor] [SR03-EN022] | Enigma On Main](http://enigmaonmain.com/cdn/shop/products/130092_200w.jpg?v=1570476351)
