The Kolkar clan is one of five clans of centaur native to Desolace, having settlements in the Barrens and Desolace. The founding leader (Khan) of the Kolkar was Kolk, an alleged son of Zaetar and Theradras and first of the centaur Khans, though currently they are led by Khan Dez'hepah and his officers.
The Kolkar clan holds no alliance with their brother tribes, constantly warring with the Horde, Alliance and other centaur alike.
During the tauren struggle to reclaim their ancestral lands of Mulgore leading up to the Third War, the Kolkar of the Barrens were the main aggressor preventing the nomads from reaching their homeland. It is also likely that the Galak clan fought against the tauren during these same events. After the tauren and their orc allies' victory over the hostile centaur, the Khans were left with nothing more than further hate towards these invading enemies, throwing all three races into an endless struggle to maintain land.
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