Ghazghkull Mag Uruk Thraka was a powerful Ork warlord from Warhammer 40,000 who also went under the name of the Prophet of the Waagh! and the Beast of Armageddon.
He is an infamous individual due to his actions in the second and third Armageddon Wars and was considered extremely megalomaniacal, even for an Ork, convinced he was blessed by the Ork gods themselves.
In late M41, the Eldar of Ulthwe prevented a Waaagh! from endangering Craftworld Idharae. In the process, this act raised Ghazghkull Thraka to prominence.
The earliest records of Ghazghkull since that time were recorded nine years before the Second War for Armageddon. At this time, Ghazghkull was a lowly Ork Boy in the armies on the planet of Urk (possibly where part of his name came from). A Space Marine force of an unknown chapter raided the planet in the hopes of disrupting the Ork forces building up there. During the battle, a bolter round tore into Ghazghkull's skull, destroying 30 percent of his skull and pulping a good portion of his brain. He was found by the notorious Painboy known as Mad Dok Grotsnik, who rebuilt his skull with adamantium. Somehow this enabled Ghazghkull's latent psychic powers, convincing Ghazghkull that he had been somehow blessed by the Ork Gods and from here on in he claimed to be in communication with Gork and Mork. Convinced he was marked for great things, within six years he had risen to the rank of Warboss of his tribe. A year later two events occurred, giving Ghazghkull the opportunity to further his dominance and begin a great Waaagh!. Firstly, Urk's sun had begun to die. Severe solar flares caused many deaths from radiation. Secondly, a massive space hulk appeared in orbit around the planet, offering escape from certain death. Ghazghkull managed to subjugate the other tribes on Urk, who combined to form the genesis of a Waaagh!. While en-route through the warp, power systems on Ghazghkull's hulk failed several times and the Warboss and his new Ork charges had to fight off continuous Daemonic attacks, providing them with plenty of battle experience.
The hulk found its way to the Armageddon system. Once sighted by the Imperium, the hulk was code-named Alveus Alpha Alpha Sextus by Imperial Administrators. Its weapons demolished the defences of the Armageddon system, including obsolete orbital satellites and small attack craft. Desperate messages were sent in the hope of acquiring aid. Three Space Marine Chapters began to organise themselves but would not be able to get there before the Orks landed. A month later the Orks disembarked, beginning the Second War for Armageddon in earnest on the day of the Feast of the Emperor's Ascension in 941.M41.
Ghazhkull's attempted conquest of Armageddon would be foiled by his arch-rival Commissar Yarrick, but the Warboss would later capture his hated enemy during the Battle of Golgotha. After a few weeks of torture, Ghazghkull decided Yarrick was too much fun for the "new" fight he was already planning and released the Commissar.
Fifty-seven years to the day after launching the Second Armageddon war, Ghazghkull once more invaded Armageddon, this time with an even larger Waaagh! at his disposal. Though initially conquering half the planet's surface in extremely bloody fighting, Ghazghkull became bored with the stalemate that was developing on Armageddon. Leaving the settlement of the conflict to his Nobz, Ghazghkull left Armageddon in search of a new more exciting fight. His old enemy, Commissar Yarrick, followed him and vowed to slay the Warboss at all cost.
Over the course of his campaigns, Ghazghkull recruited some of the most powerful Ork Warbosses as his allies. These included: