Vayne Carudas Solidor (???????????????, Vein Karudasu Sorid?ru?) Vayne is the third son of Emperor Gramis and Larsa's older brother, as well as the primary antagonist of the game. He is the twenty-seven year-old Consul-Governor of Archadian-occupied Dalmasca, Commandant of the Archadian Empire's Western Armada and a member of House Solidor, whose members had led the Empire for four generations. This in effect makes him a "Prince", though as he states, the democratic nature of the Empire makes him no more eligible for the throne than anyone. He often laughs off those who attempt to give him the respect his title would command and makes efforts to reach out to the conquered Dalmascans who make up his jurisdiction.

However, while he honestly cares for the welfare of the people and of his family, particularly his younger brother Larsa, Vayne is Machiavellian in his methods, willing to use any means necessary to maintain order. He ensures the complete subjugation of Nabradia and Dalmasca, even exterminating their royal families, in order to acquire their deifacted nethicite. He confronts Dalmasca's resistance movement with absolute ruthlessness, accepting no surrender. He even goes so far as to murder his own ailing father and frame the Imperial senators, to put an end to their scheming against himself and Larsa. Vayne's ultimate goal is to free humanity from the control of the Occurians, a race of god-like beings that have, for centuries; secretly meddled with the course of human history. In doing so, he undertakes his noblest goal—freeing humanity from the slavery of the gods—and commits his ultimate act of villainy—toppling kingdoms, building massive warships, and leveling entire cities in nethecite testing experiments—in order to achieve his goal.

During the Battle over Rabanastre, Vayne commanded the Sky Fortress Bahamut, and when confronted by the team, used the Nethicite to become Vayne Novus before being mortally wounded by Vaan. But Venat awards Vayne for helping it by sacrficing itself to give him the power of an Occurian, causing Vayne to become the monstrous Undying, grafting pieces of the Bahamut's superstructure onto his body. Despite this monstrosity's incredible destructive power, a furious battle with the team eventually forced his mechanical body to break apart, and in the resulting explosion caused Vayne to be blasted into oblivion.