Secure the Fellmere Harvesting Grounds so the masons can work safely. 1. See Warehouse Keeper Norman in Gludin.
2. He will send you off to the Fellmere Harvesting Ground to kill Young Araneids, Cloudy Beasts, and Giant Poison Bees.
3. You can kill as many as you like, there is no limit. Once you are done hunting here you can return to Norman for a reward based on the number of beast quest items you have acquired (it seems to be roughly around 50-60a per item)