Galbatorix

Galbatorix is the main antagonist of the Inheritance cycle. He is the immortal and demented ruler of Alagaësia and he is fighting against the Varden and the kingdom of Surda. He is the traitor that led to the destruction of the Riders. When his first dragon, Jarnunvösk, was killed and he was not allowed another one, the enraged Galbatorix turned against the Riders, later using dark magic to bring the dragon Shruikan under his rule. He spreads war, madness, and chaos throughout Alagaesia, and will not be content unless he rules it all. His unusual (and growing) magical strength is derived from the captured souls of dead dragons, the Eldunarí, which means "heart of hearts". Galbatorix spent decades hunting down said Eldunarí, and he seems to have abandoned this practice in favor of finding the "true name" (though whose or what's true name is unclear - it has been speculated that the name he is searching for is the true name of the ancient language, or Eragon's true name). Galbatorix captured the Eldunarí of the first Rider he killed and subdued it, "likely with the help of Durza," as it says in Brisingr. Galbatorix rarely leaves his citadel in Urû'baen, his capital city and the center of his Empire (which starts at the coast and ends at the Hadarac Desert) which he conquered when he deposed King Angrenost of the Broddring Kingdom. His appearance is not known yet apart from having black eyes, but his personality is known to be charming and persuasive in certain conditions, and violent and intimidating in others, according to Murtagh. It has been said that 3 people have discovered his true name, however he put a spell around his name that kills anyone who uses it.