The Advisor

Little is known about who this mysterious one is, they are presumed to be of Void-Descent as they are not terrestrial in format nor do they speak mortal languages. What is known is that when they appeared, Dorvan had a shift in personality and the power Aradia held over him had been shattered; where before he believed he was made to serve her undying and resolute, now he wishes to burn away all of her creation.
Speculations range from the entity being a High Demon in disguise on the mortal plane, a creator such as the Shadewalker, or perhaps a mortal who long ago abandoned their sanity for a promise of power. Regardless anyone who has spoken against the Advisor has been summarily executed for high treason at Dorvan's order. Whatever this thing is, Dorvan is wrapped around its finger.
It wears an odd sort of attire, bearing plain greyish-black garments that match its skin tone, eyes, and its hair remains a sheath of black. It wields gray gloves bearing crosses. Nobody has even seen the Adviser take up combat so it is unknown whether or not is has an sort of skills in this regard. What is known is that is a master of manipulation, having turned a powerful and willful Drow into a menacing force of hatred and destruction.
The Adviser is quite the odd variable...