After getting the quest, map travel to Doomlore Shrine and run through the Dalada Uplands to the portal to Sacnoth Valley. You can run avoiding all mobs there but a small group of Charr Seekers. Anton is located near portal when you walk in (#1 on the map). Proceed to the waypoint (#2 on the map) and defeat Rend Ragemauler and his guards. One other small Charr mob may interfere while or after fighting Ragemauler's group.