Why I made this guide, because I see a lot of player leave Treasure Seeker unkilled, and thats extra gold to your bag!
1. Pick up your quest
2. Move to location
3. Harvest the plant
4. Kill the Treasure Seekers
5. Get all the coins
Source:http://forum.fedeen.com/viewtopic.php?f=90&t=1642&sid=b6bcc7832d4b71d32f0649955f42d346