The Gazing Eye



The Gazing Eye is a Keyblade created by the Master of Masters, forged with one of his eyes. The Master of Masters would pass on his Keyblade to his first apprentice Luxu, who would then pass the Keyblade on to his apprentice, and so forth. With this chain of passing on the Keyblade established, the Master of Masters would use the Keyblade to observe various future events in order to write the Book of Prophecies in his time.

Eventually, the Keyblade would be passed down to Master Xehanort. In Kingdom Hearts Birth by Sleep, although he doesn't often draw the Keyblade, Master Xehanort wields his weapon whenever he fights, to channel his own dark magic and to use the ability to lock and unlock hearts.

Kingdom Hearts Birth by Sleep
Master Xehanort used his personal, unique Keyblade to extract his apprentice Ventus's dark half from his heart from his body to create his second apprentice Vanitas, to fire bullets of darkness that scarred his former friend Master Eraqus, to fight with Vanitas against Terra, Ventus and Aqua and to exclusively fight against Terra.

After Master Xehanort extracts his own heart to take over Terra's body, Terra-Xehanort used Master Xehanort's Keyblade to battle Lingering Will and then Aqua but Terra's heart begins throwing off Master Xehanort's control, forcing Terra-Xehanort to use his Keyblade on himself but ended up sealing away both their hearts and to lose the power to summon a Keyblade.

Kingdom Hearts 3D: Dream Drop Distance
According to several flashbacks, Xehanort is shown summoning Master Xehanort's Keyblade to release the hearts of Even, Ienzo, Aeleus, Dilan and Braig.

After his revival, Master Xehanort summons his personal Keyblade in an attempt to infuse his own essence into Sora but Lea saves the boy from Xehanort's attack.

Kingdom Hearts III
To be added.

Design
Master Xehanort's Keyblade has a spiky, black guard resembling demonic wings, a horned, demonic head just above the handle, two barbed shafts, and teeth resembling a battle axe split into three almost claw-like protrusions. It resembles the Oblivion Keyblade to a degree, but with two shafts and a different head. Its shaft and head are adorned with several twisting, silver patterns. It also contains two demonic, blue eyes (similar to the one on Riku's Soul Eater and Way to the Dawn, Terra's Chaos Ripper, Vanitas's Void Gear and the alternate timeline Xehanort's Keyblade) with one on the Keychain and the other one on the head.

Master Xehanort is capable of converting his Keyblade into an orb of dark energy, which is shot into the sky to summon Kingdom Hearts. His Keyblade possesses a Keychain, which has a black charm with another demonic blue eye upon it.

In Kingdom Hearts Birth by Sleep Final Mix, No Heart has displayed the ability to transform Master Xehanort's Keyblade into various forms including a shield-like form which creates a barrier of dark energy, a greave which he uses for kicking attacks, an arm bracer with the blade protruding past his hand for offensive capabilities, and wings for flying attacks.