Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by shuffling 1 Spellcaster or Warrior Ritual Monster from your hand or GY into the Deck. You can only Special Summon "Black Chaos" once per turn this way. You can discard this card; place 1 Continuous Trap that mentions "Light and Darkness Ritual" from your Deck or GY, face-up on your field. While you have a Ritual Spell in your GY, this card is unaffected by your opponent's activated effects. Once per turn, during your Main Phase: You can banish 2 cards your opponent controls.