Kill the named and then the adds to spawn Ashokh. (See the talk page for a discussion of the possible problems you might have with the order of killing.)
Kill Deiga Q'Rin (37^^^ heroic) at ( -15, 0, -8 ) Copy/waypoint -15, 0, -8, and absorb her essence.
Then kill her adds (a pair of 37v heroics).
Kill Vaera L'Far (37^^^ heroic) at ( 35, 0, -21 ) Copy/waypoint 35, 0, -21 and absorb her essence.