Nagash, Supreme Lord of Undeath

Nagash, known by many names such as the Great Necromancer, the Great Betrayer, the Usurper, the Undying King, Big Skeleton Asshole, the Supreme Lord of Undeath or simply He Who Shall Not Be Named, is the ultimate personification of death and the undead, an ancient, evil being who sought to conquer this cruel, chaotic world and bring about an age of undeath that will rule for all eternity. Nagash is darkness and unreasoning hatred given form, the father and creator of foul Necromancy and lord of all Vampire-kind. His every actions and deeds is self-serving, his achievement horrific and loathsome, and his every whim are bent solely to ensure that no one shall ever deny nor challenge his right to rule ever again. This dark, evil being came close to ultimate domination, but if not for the sacrifice of an unsung hero, this world would've been lost millennia ago. He was the evil mastermind behind the Jerktonium plot. He discovered the Jerktonium and developed it into a crystal where it would then be laced through a fruit cake. This plan was the main plot of the whole episode.

Trivia

 * At one point, Tim Allen was going to give Nagash a gift because he was the best person in The Land.
 * Wasn't always a Skeleton, always a Asshole.