Bloody Sun Boyz
The Bloody Sun Boyz were a successful Greenskins clan under Black Orc Warboss Grimlock and Goblin Shaman Gazbag. This clan grew in amazing size in part due to the skill of it's leaders in conquering and subjugating those in rival clans to do their will. This clan also plays a prominent role in Warhammer Online: Age of Reckoning, with the official plot involvement provided below, from the official site.
WARNING. The below MAY CONTAIN SPOILERS.
As part of his plot to conquer Ulthuan, Malekith must manipulate the Empire into asking the High Elves for aid. To ensure that this happens, the Witch King devises a plot to embroil the Dwarfs in a war with their ancient adversaries, the Orcs and Goblins, ensuring that they cannot come to the Empire's defense in its hour of need. Without help from the Dwarfs, the Emperor will have no choice but to turn to the Phoenix King of Ulthuan for help, and when the armies of the High Elves sail for the Old World, their island home will be ripe for invasion.
Malekith dispatches hunters to the Badlands with the task of capturing the most powerful Orc Warboss that they can find and bringing him back to Naggaroth. They return with Grumlok and Gazbag, to whom Malekith gives amulets that increase their powers tenfold. When the Orc and Goblin return to their tribe, they lead a campaign to conquer their neighbors and amass a great horde. Compelled by the power of their amulets, Grumlok and Gazbag march to Karak Eight Peaks and obliterate the Dwarf garrison there, taking over the fortress.
Grumlok has summoned all the tribes of the Old World to join his great Waaagh!, but it is the Bloody Sun Boyz who will command the most respect and fear among their green kin. Grumlok expects his lads to keep the other Orcs and Goblins in line, and when the time comes to break down the great gates of Karaz-a-Karak and rampage through the streets of the Dwarf capital city, it is the Boyz who will lead the charge.