Dealer Vijaad is a level 65 ethereal quest giver found in Darkweaver Syth's room to the west in Sethekk Halls. Hidden from view of the Sethekk within a barrier, he is looking to hire some help to get rare gems for a buyer: the eyes of the wind serpents inside the dungeon, in exchange for a cut of the profits.
Even if players do not notice him right away, he will walk up to them after Darkweaver Syth is killed.
Not to worry, <class>. With this barrier in place, the arakkoa cannot see me.
I'm here on business.
Patch 4.3.0 (2011-11-29): Added.