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.
Just played against a spellbook deck. Special summoned both dragon and wyvern on opponents turn. Both times they still able to be targeted and banished by spellbook of fate that turn.. am I reading the card interaction wrong?
Your AG beast is only protected on summon bruh. Since yubel terror's effect activates on your opponent's end phase, fortress' effect wasn't in play...unless you can name a card that could've special summoned AG beast during your opponent's turn