Iuz
Iuz is the half-fiend or cambion demigod son of Grazz'zt, a demon lord of the Abyss, and the human witch Iggwilv. Originally described as very handsome, Iuz now appears either as an old man with poisonous spit, or a big, red, hulking demon like creature. His weapon of choice is the whip and greatsword. He is refered to as "The Old One" or Iuz the Evil, and worshipped as the God of Deceit, Pain, Opression and Evil. He is considered the enemy of every sane and free person in the Flanaesse and every religion, except his own and holds a particular hatred for Zagyg, Vecna and St. Cuthbert.
In 479 CY, a warlord in the Howling Hills left control of his land to his "son". In less than three years, that territory was expanded, creating a small kingdom. Refugess from his conquests told tales of a road of skulls leading from the hills to the capital of the land, Dorraka. They told tales of Iuz being the son of a demon and a necromancer, being a 7ft tall demon driven by destruction. They claimed he had an army of evil men, terrible wizards and savage orcs, and worst of all, fiends. It was about this time Iuz used a dark ritual to steal power and lifeforce from many victims, making himself a demigod.
In 505 CY Iuz vanished. Many of the orcs, clans that had served him for years, as well as some of his human followers claimed he has ascended to full godhood, begining to worship him, and actually able to perform cleric spells based on their worship. In reality, Iuz was trapped under Castle Greyhawk by the Lord Mayor of Greyhawk, Zagig Yragerne in the Mad Archmage's own quest for godhood. During this time, some of his more opportunistic followers and a few of his fiends broke away to form the Horned Society.
In 570 CY, a group of adventurers lead by Lord Robiliar freed Iuz and he returned to his throne. Three years later, Iuz launched the Greyhawk Wars.
In 582 CY, appearing as the imprisoned god of the northern barbarian tribes, Vatun, and using magic to control Sevvord Redbeard, ruler of Stonehold, the combined forces launched an attack on Tenth. At the same time, Iuz's armies destroyed the Horned Society and conquered the Shield Lands, The Bandit Kingdom, the Barrens and the a portion of Furyondy near his boarder as well as the edge of the Vesve Forest boarding the Highvale. The war raged for three years before the various nations involved ended it. After the War, Iuz seemed unstoppable. However, his control over the nomadic Rovers was loose at best and his control of the Bandit Kingdoms was challenged by various rebel groups within the land. Most of the regions under his control are monitored by the Greater and Lesser Boneheart, a group of spellcasters and clerics that serve as commanders of his forces and administrators of his empire, as well as the Boneshadow, his most valued spies.
In 586, Canon Hazen of Veluna used the Crook of Rao to banish many of the fiends from the Flanaesse in what became known as the Flight of Fiends, which had a devestating effect on Iuz as it cost him nearly half his army Shortly after, Furyondy, Veluna and the Knights of Holy Shielding launched the Great Northern Crusade which saw the northern portion of Furyondy restored. However, the alliance discovered Iuz's forces had slaughtered every last man, woman and child, bringiong them back as the undead. A small part of the Shield Land was reclaimed, though Iuz still controls the majority of the broken nation. King Belvor III of Furyondy then declared a permenant state of war against the Empire of Iuz, which would not end until the Old One was defeated and his evil wiped from the land.