Add 1 "Gem-Knight" card from your Deck to your hand, then you can apply this effect.

?Fusion Summon 1 "Gem-Knight" Fusion Monster from your Extra Deck, by banishing Fusion Materials listed on it from your hand or your side of the field.

You can only activate 1 "Absorb Fusion" per turn. You cannot Special Summon monsters the turn you activate this card, except "Gem-Knight" monsters.