Slay the Rujarkian Highwayman Leader (lvl 48^ solo). He spawns on the Orc Highway (roughly around ( -466, -110, -191 ) /waypoint -466, -110, -191 ) in the Sinking Sands. The Placeholder is a rujarkian sentinel. Respawn time is 10 minutes
He tends to walk up and down the highway from the location above so you may need to look for him on his route.