Gamlen's Greatest Treasure - p. 1 Dragon Age II Guide
Last update: 11 May 2016
The quest giver: automatically after finding the crumpled note [Lowtown - Gamlen's House]
Step 1: Talk to Gamlen
You can start completing this quest after finishing the secondary quest Visit Gamlen. Stay at your uncle's house and find a crumpled note on the table #1 (M14, 3). After reading it talk to Gamlen #2 (M14, 4) and you'll learn that he lost his entire fortune searching for a gem mentioned in the note.
Step 2: Go to the meeting in Darktown
A main hero decides to go for the meeting instead of Gamlen, so leave Lowtown and go to the [Darktown] location. Start exploring a central part of Darktown by finding Mekel #1 (M23, 7). During a conversation #2 you'll learn that he hoped to receive a gem and regardless of a dialog option you choose, you'll have to fight him.
Kill Mekel #1 first and then attack his henchmen. All your opponents here are rather weak, so you can win the battle easily. After that search Mekel's body, finding a note entitled the Wallop Mallet #2.
Step 3: Return to Gamlen's house
You can leave Darktown now and go again to the [Lowtown - Gamlen's House] location. Talk of course to Gamlen #1 (M14, 4) asking him about the Wallop Mallet. After the conversation click on this item, this hangs on a wall nearby #2.
Step 4: Examine the sacred tree in the Elven alienage
According to the updated information, leave the Gamlen's house and go to the [Lowtown - Elven alienage] location during the day. Find a place, where you can examine The Tree of the People Vhenadahl #1 (M12, 23). This will lead to a conversation with one of the Elves #2, who will tell you that he waited for someone interested in the tree. You'll get a waybill from him, from which you'll learn that someone wants Gamlen to go to one of warehouses in docks in order to examine contents of a certain crate.