At the beginning of this quest, Gulthga will grant you a blessing of Cazic Thule. This adds a proc against lizardmen to the Ethernere Affinity buff. After this quest is completed the proc will be removed.
Note: Take a druid portal to Obol Plains, then use The Turbullion for fast travel to this part of Eidolon Jungle.
Staff of Fright is to the right of the entrance of the waterfall.
Staff of the Wastes: ( -361, -13, -305 ) /waypoint -360.65, -13.10, -305.28
Reach the lower temple grounds. This update will occur at ( -404, -2, -105 ) /waypoint -404, -2, -105
Slay the leader of the lizardmen, Venekor (96^^). (-375, 0, -404) You have to kill enough of the trash mobs to spawn Kilkilarus. Kill him and Venekor will spawn. He's at the far north part of the zone. He will summon all of the unkilled Pained Wretches if you let him.