Tairi X

Tairi, also referred to variously as King X and the Devil, is a major character in Misery of Magic

Story
It is not known where he was originally from. When he arrived in the Domain of Magic, it was in turmoil due to the influence of the Winsterton, who was attempting to overturn the natural order of the Domain to create a utopia in its place.

The End, seeing the potential in Tairi, granted him the remaining available End Tools and sent him to fight the Hero. They had a protracted battle in the North Edge. Eventually, Tairi won. While the Hero had become immortal by that point, Tairi was able to use the End Tools to seal him inside an indestructible box, which was left in the North Edge.

Tairi has an extensive mastery of the Psycho Power, which he uses to combat Winsterton's sinister psychic presence. He has also developed a unique version of the power known as "crossing the void". This is an extended psychic projection ability which allows one to project oneself and others out into locations outside the Domain. While Tairi has the ultimate goal of reaching Earth, he does not have the power to do so yet, and it is not clear if it is even possible. However, he is seen to cross the void to reach "void locations" -- specifically Club 38 and Ultima Thule -- which are neither part of the Domain nor of Earth.

In-Game
Tairi appears as a neutral NPC in Emerald's dreams when he blacks out after activating the power in Research Station 0-Y in Backwoods. He also appears as a psychic projection at the bottom of the Remnant and also the room with the Crazy Water where the Awakening takes place. The next time he appears is in North Edge, where he speaks to both Emerald several times and then to Max.

Most of the time, Tairi speaks through the Psycho Power and only rarely appears in person. If, after reaching Eastern Top Level, Emerald returns to the beginning of Shade Hollow, Tairi will be there in his physical form. He also appears physically at the White Table.

Trivia

 * If Emerald meets Tairi in Shade Hollow, he will acknowledge that if he is later encountered at the White Table.
 * Aurora came up with the name "Tairi" in 2010. Don't ask him what it means. The "X" part is inspired by both the mediocre Sonic-themed horror story Sonic.exe/Round 2 as well as Aurora's short-lived 2012 webcomic Cloudspace Material Iiptica