It is unnecessary to first speak to Tamari. You can simply bring her the Plagued Kithraya Hive Queen's severed head to complete the quest. However for completeness, head north from the Eirulan teleporter to the next tramway, which takes your party to the Inn. Board the tram and take it across to the Inn. Head south along the boardwalk around the Inn until reaching the second tramway, which will take your party to the Falls. Board the tram and ride it over to the Falls. Head east up the boardwalk to Fenella's house and enter it. Open the door in the back of her house and continue on through it to the elevator behind her house. Activate the nearby switch to move your party onto the elevator and descend. Once down, follow the pathway to the bridge by the falls, then cross the two bridges to the north and note the ghost standing upon the second one, if your party hasn't already released it. Cross the third bridge and head up the small hill to the elevator. Activate the nearby elevator switch to have your party ascend back up to the boardwalk. Continue southwest a short distance to Tamari's house. Enter and speak with her about her fear of insects and hear her story about the queen she encountered in the Kithraya Caverns. Offer to help her by destroying the queen to acquire this quest.

Exit the house and continue their southwestern trek a short distance to an upraised section of boardwalk. Activate the switch near the bottom to lower the section. Proceed across it and your party is back out in front of Fenella's house to the east. Head west and take the tramway back to the Inn. Go south around the Inn to the second tramway, which will take your party back to the Blacksmith Shop, etc. Take it across, then head south past the Eirulan teleporter (however if your party's already been to the Southern Greilyn Jungle and its teleporter is active, just teleport there and continue reading with the next paragraph, or if they've already activated the Eastern Greilyn Jungle teleporter, go there, and continue reading with the second next paragraph, or if they've already activated the Kithraya Valley teleporter, go there, and continue reading with the third next paragraph), to the second tramway, which will take them to the Pet Shop, South Gate. Board this tram and ride it across. Head southeast around the pet shop to the South Gate and the elevator down to the Southern Greilyn Jungle. Talk to the Guard Captain if you've not already done so, then move on to the elevator and activate the nearby switch to move down into the jungle. Head up the path to the southeast battling the Hak'u along the way until they come to the Southern Greilyn Jungle teleporter.

Continue east through Razka's Ruins and into the Eastern Greilyn Jungle. Just follow the path and don't deviate until they reach the Dryad Exile Colony. Head east from the Dryad Exile Colony up the first two hills and continue along the path. When they get to the fork in the path, deviate to the south and activate the Eastern Greilyn Jungle teleporter, if they haven't already done so.

Return to the fork in the path and continue up the hill to the east toward the Kithraya Caverns. When they reach the bridge, cross it to the south and continue until entering A Narrow Cavern. Continue along the path through the cavern until they re-emerge into the Eastern Greilyn Jungle. The path winds around to the west and Vix's "cabin" is just up ahead. Enter and speak with him, but decline his offer to join your party at this point. He'll run off to the local Tavern. Pick up "The Skath" on the floor and grab the Lesser Chant of Magic Awareness and the Lesser Chant of Ranged Awareness near the rear door, then continue on through the rear door and enter The Upper Kithraya Caverns. Follow the path south through the cavern until it turns to the east, then continue in that direction. When they get to the broken elevator, note that they can't and Finala can and will need to repair it during her later quest. Continue on until the exit the cavern and activate the Kithraya Valley teleporter. If you don't encounter a teleporter, back track through the narrow passageway to the broken elevator and then head east and out the other exit.

  

Continue a short distance through the jungle and then enter The Lower Kithraya Caverns. Once a little way in, if this is your party's first journey through the caverns, a short cut scene will be shown, where a large spider like creature expires from coming into contact with some green haze, which spouts from small volcano like formations in the ground. The green haze is hazardous to the denizens within the caverns, but not to your party (only in Mercenary mode I think). Move your party forward into this area and when they come to an apparent "T" junction, the northern path ends in a dead end, so take the southeast path. If you haven't been through here before, a short cut scene will be shown, where one of Vix's men, mentions that something horrible is happening at the beach, which is killing all of their men, and is then overtaken by the plague and he and his men have to be destroyed. Continue along this way generally heading east and destroying other of Vix's plagued soldiers as they go. When you note a large rib cage below, your team is getting close. When the path forks, proceed along the southeastern branch and note that the frequency of battles against large groups of enemies has increased (i.e. they're protecting the queen). Use the 'Tab' key if you wish, to bring up the larger map and note the star off to the southwest. Once you see the previously mentioned rib cage, A Large Insect Egg Chamber is not far beyond. Enter it and do battle with the Plagued Kithraya Hive Queen. Destroy her to acquire her severed head, then loot the back of the chamber.

Teleport back to the town of Eirulan and revisit the Falls. This time your party can bypass Fenella's house, heading straight down the northeastern boardwalk path to Tamari's house, which is indicated by a star on the map. Enter and speak to Tamari, who has an orange question mark icon above her head. She'll see the severed head and express relief at the insect's destruction and give your party their reward of gold and items, which completes the quest.