You can target 2 Level 10 monsters you control; Special Summon this card from your Spell & Trap Zone, then attach those targets to this card as Xyz Materials. You can only use this effect of "Armageddon Drakos, the True Sovereign King" once per turn.
2 Level 10 monsters Once per turn, you can also Xyz Summon "Armageddon Drakos, the True Sovereign King" by using 1 Level 10 Pandemonium Monster you control as the Xyz Material. If you can Pandemonium Summon Level 10, you can Pandemonium Summon this face-up card in your Extra Deck. If this card battles an opponent's monster, during damage calculation (in either player's turn): You can detach 1 Xyz Material from this card, then target the opponent's battling monster; its ATK becomes 0, and if it does, this card gains 1000 ATK. These changes last until the End Phase. If this card in the Monster Zone is destroyed by battle or card effect: You can place this card in your Spell & Trap Zone.