Umber

"The Urxen are the first and most numerous of all the Fallen tribes. There are many who believe that the great migrations of the Urxen tribes in the last millennium - their journey north, their shift in loyalties from Curgen to Illosa, the Lady Umber - was the single most important factor in the Emperor's downfall."

Umber
The Urxen have racial abilities which are the same for both sovereigns, there is also unique equipment for the corresponding racial abilities.

Racial Perks Unique Equipment
 * Assassin's Tools
 * Master Scouts
 * Warriors
 * Masterwork Chainmail
 * Masterwork Chain Armour
 * Vial of Poison
 * Skath Claw
 * Scimitar

Kulan
Perks
 * Urxen Blood
 * Death Apprentice
 * Air Disciple
 * Might
 * Discipline
 * Cruel

Moria, Queen of Gandru - Leader Pack DLC
Perks
 * Urxen Blood
 * Death Apprentice
 * Water Disciple
 * Treasure Hunter