You can discard 1 card; send 1 Fiend monster from your Deck to the GY. You can send this face-up card from your Spell & Trap Zone to the GY; send Infernoid monsters with different names from your hand and or Deck to the GY, up to the number of monsters your opponent controls that were Special Summoned from the Extra Deck. You can only use 1 Void Apocalypse effect per turn, and only once that turn.