The Master of Masters

The Master of Masters, also known simply as The Master, is a Keyblade Master that appears Kingdom Hearts χ. He is responsible for creating the Book of Prophecies using his gift of foresight, as well as for training his apprentices Luxu, Ava, Gula, Invi, Aced, and Ira.

Before Kingdom Hearts χ
According to the 's Chirithy, the five Foretellers and one other Keyblade wielder were the apprentices of his creator, "The Master of Masters". Shortly before he disappeared, The Master of Masters assigned his disciples new names and gifted five of them with a tome from the Book of Prophecies, which taught them of the event that would doom the world.

Kingdom Hearts χ
After helping Chirithy fend off the Minute Bombs in Daybreak Town, the Player goes to sleep and has a dream in which the five Foretellers are conversing with their master. Before the Player has a chance to approach the Foretellers and their mysterious visitor, they are engulfed in darkness and wake up.

Later, when the Player has another dream of Ephemer entering the clock tower through the sewers, The Master of Masters can be seen watching him from the shadows.

Appearance
The Master of Masters conceals himself in a black coat. His eyes, one of which he has placed in Master Xehanort's Keyblade, are blue with catlike pupils.

Personality
The Master of Masters is rarely serious, often making goofy movements and actions. With his gift of prophecy, he knows what will happen in the future, and has taken a carefree look to the impending Keyblade War. He entrusts Luxu with what will eventually become Master Xehanort's Keyblade, a Keyblade in which he has placed his Gazing Eye so that he will have precognition of everything the blade observes through the ages as it is handed down, and shows curiosity about how the world will be once the war is over.