You must place the swamp phlogiston wards in specific locations marked by others (the locations are marked by green shinies):
You must place three wards in Trakaraptor Alley at ( -596, -46, 358 ) Copy/waypoint -596, -46, 358, ( -513, -72, 484 ) Copy/waypoint -513, -72, 484, and ( -429, -82, 593 ) Copy/waypoint -429, -82, 593.
You must place one ward north of the Outer Sebilis gate, at the end of Trakaraptor Alley at ( -316, -99, 728 ) Copy/waypoint -316, -99, 728. Attacked by mob (Level 77 Elite Shardhammer) here. Location is in a building accessible by rocks at ( -341, -112, 687 ) Copy/waypoint -341, -112, 687
You must place one ward at the Outer Sebilis gate at ( -84, -120, 952 ) Copy/waypoint -84, -120, 952. Be careful of Zelgad the Western Lord, an 85 ^^^ Epic x2 located just beyond the gate.
You must place the last ward at the Outer Sebilis gate at ( -71, -118, 1012 ) Copy/waypoint -71, -118, 1012. Attacked by another mob (Level 77 Elite Shardhammer).
Return to Slixin Drusar at ( -110, -85, 304 ) Copy/waypoint -110, -85, 304.