Archfiend of Despair [Battlebond] The Lost Millennium when an opponent's DARK monster

when an opponent's DARK monster activates its effect: You can detach 1 Xyz Material from this card

Having recovered from his grievous injuries

When a card on the field is destroyed by battle or by a card effect

Transfer this card's materials to the Summoned monster

You can only control 1 "Bujintei Kagutsuchi"

Archfiend of Despair [Battlebond] The Lost Millennium when an opponent's DARK monsterSet: Battlebond Type: Creature Demon Rarity: Mythic Cost: {6}{B}{B} Flying Your opponents can't gain life. At the beginning of each end step, each opponent loses life equal to the life that player lost this turn. (Damage causes loss of life.)