Rogue's purse must be obtained in the following method and cannot be used from anywhere else. * Go back by the Harpie Bug Swarms and head west from there until a cave is seen. Look for a square with some rocks in it that say 'Search Rocks'. * Inside the cave are level 57 Jogres. Look for green spots on the "fungus covered wall", search them for the grimy rogue's purse. * Clean the herb. * Talk to Trufitus. * Quest complete!