The orruks of the savage Bonesplitterz warclan charge into battle.
The Bonesplitterz are an orruk warclan native to Ghur, the Realm of Beasts, and the wildest tribe of orruks to ever rampage across the Mortal Realms. They are a savage and feral clan, who have given up the "kultur" and technology of their more "civilised" counterparts to live a primitive, stone age existence more in accord with the bestial spirits of Ghur.
When orruks gather in large numbers and go to battle, they feel the gestalt magical energies of their species, the Waaagh!, course through their bodies and are sent into a violent frenzy. The Bonesplitterz are a warclan comprised of orruks who have had their minds filled with the furious energy of the Waaagh! and remain affected by it even long after the battle is over.
Such unusually sensitive orruks eventually leave or are forced out of their warclans, roaming the wilderness until they are led by their great green god Gorkamorka to more Bonesplitterz, just as maddened as themselves. Covering themselves in tattoos and war paint, they abandon the clothing and metal weapons of their fellow greenskins.
These savage warclans are lead by Wurgog Prophets, powerful orruk shamans supposedly gulded on their warpaths by signs and visions from Gorkamorka.
The Bonesplitterz believe that magical Waaagh! energy can be found in the souls of wild beasts, and so they hunt the most fearsome and unruly monsters they can, gaining power from their beast spirits. They use the bones of their prey to create most of their primitive weapons and fetishes to channel the spirits in battle.