The Kur'tarak

The Kur'tarak are Vaasan barbarian tribes who follow the will of the Abyss. Long ago guided and sometimes controlled by demons loose in the Vaasan wilds, the Kur'tarak believe that it is only a matter of time until the demons take Vaasa, and they intend to be on the winning side.
All of the tribes have different reasons for this betrayal of the material plane, but all are committed to the Abyss and their Abyssal Lords.
There are about a dozen human tribes that can be considered Kur'tarak, and they all war against one another. Some of the larger human tribes include:

• Blackearth

• Bloodspine

• Cleftskull

• Howlingblood

Several Orc Clans also can be considered Kur'Tarak, these include:

• Dead Eye Clan

• Defiled Corpse Clan

• Gutspear Clan

• Skittering Ravagers

• Skull Eaters

• Twisted Nail

Orc clans which follow Gruumsh consider these clans to be non-orcs.
Gnoll Clans are almost by definition Kut'tarak. Though there are several clans that either worship Malar as God of the Hunt or even pay tribute to the spirits. For the Kur'tarak tribes which universally worship Yeenoghu, these aberrant tribes are to be wiped out, holding these tribes above any other threat.