Note: if Warlord Sel'Nok don't give you the quest, reapply Guise of Pursuit if you have it for every quest he gives.
Kill 15 Danak regimentals near Howling Stones post or around ( 127, -26, -51 ) /waypoint 127, -26, -51
Each kill reduces your faction with the Legion of Danak by 100 points. If, however, you use your merc to get the updates or is you use a pet and do not get too close, there appears to be no faction impact.
From the Howling Stones post and around the corner to the left is a good number of Danak Regimentals needed to kill to fulfill his request.