A similar entry appears in the Wheel of Time Companion. Other information about the character is also included in the Companion, but we did not use it in the TarValon.Net Library.
Adsalan is a Warder serving the Black Ajah hunters Egwene encounters in the Tower. His Aes Sedai is unknown, but Egwene believes none of the Sitters present has a Warder, so he is likely to be bonded to one of the spies sent in by the Salidar Aes Sedai. He is described as having ruddy hair and a square jaw.
(Reference The Gathering Storm, Chapter 12)