Ultima Weapon is a form for Sora's keyblade in Kingdom Hearts and Kingdom Hearts II. In both games, it is synthesized by the Moogles, but the appearance and abilities are different for each game. In either game, it is the strongest Keyblade in terms of strength and MP.
Kingdom Hearts: Chain of Memories
Kingdom Hearts II
- 13 Orichalcum+ (required Energy Crystals to reduce the quantity to 7)
- 1 Orichalcum
- 1 Mythril Crystal
- 1 Dense Crystal
- 1 Twilight Crystal
- 7 Serenity Crystals (Energy Crystals available to reduce the quantity to 4)
There is the option to sysnthesize an upgrade to the Ultima Weapon simalar to save the Queen+ and Save the King+ in Kingdom Hearts 2, but it is not possible under normal means, as it calls for more Orichalcums than can be found in game or reduced via synthesis items.