Linu's Tale - NWN Henchman Quest (Chapter 3)
Linu's Tale is the third and final quest that's given to you by Linu, one of the available Henchman in the Neverwinter Nights Main Campaign. Every Henchman will have a unique quest that will become available from talking to them during the chapter. These quests are locked behind character levels, if your Henchman tells you that they will "finish the story later" it means you have to level up more.
Note: If you did not complete this Henchman's quest during Chapter 1 and Chapter 2 then it will not be available to you during Chapter 3. Also, if you did not keep their quest reward with you from Chapter 1 and 2 then they will be unable to upgrade it and may not offer you the quest either.
For this version of Linu's Tale you're tasked with obtaining the Volcanis Oak Seed which is found in the Fort Ilkard Ruins map (south of Fort Ilkard). In the southern portion of this map you'll find a cluster of standing stones (pictured below); the Volcanis Oak Seed can be found in a pile of dirt near these stones.
Use my screenshot below if you need help locating this area or the Volcanis Oak Seed item.