The Evolved Dumahim skin was a skin available for the Reavers of the Dumahim clan in Nosgoth. Unlocked at level 25 or by Runestone purchase, the skin represented the adult version of the initial fledglings and the first steps of devolution toward the forms seen in Legacy of Kain: Soul Reaver.
"The Reavers of Dumah have adopted their trademark armor, the beautiful and deadly designs that will follow them into their total devolution. Believing they are the greatest warriors of the Clans, they have adorned themselves with the finely detailed vestments similar to that of Dumah himself. Here you can see hints of the monstrosities they will eventually become in Soul Reaver."
and further elaborated:
"For the Dumahim, we made ties to their clan lord Dumah's pan-Asian themed armor decoration. Astute viewers will notice little details like the faces in the shoulders, and the metal crow's skull in the center of the chest. Their hands have metal blades crafted over their claws to give them even more durability. The hair and head shape give hints of the monstrosities they will become."
The "Evolved" skins were designed by former series artist Daniel Cabuco as deliberate call-backs to the devolved forms of the clans seen in Legacy of Kain: Soul Reaver and as such each contains a number of artistic features which relate to their future forms. The Evolved Dumahim notably contains many references to the Fledgling Dumahim, Adult Dumahim and their patriarch Dumah including their skin coloration, armor design and the 'ribbed' head texture - itself a reference to Dumah's helmet-less appearance in a previously released action figure.