This section of the Guide to Greedfall contains a walkthrough of the side quest Islander Knowledge, commissioned by Aphra.
Where to start the quest?: Talk to Arpha.
Go to the place, where Dorgred stays with his companion. You have to fight enemies that look like overgrown salamanders - be careful, as the opponents are some of the strongest in the game.
After the battle, you have to give Aphra materials for the antidote - they are quite common - so you should have them at your disposal - in case of problems, search the bodies of the defeated animals. The woman will prepare the antidote for you - give it to Morian. After the cut-scene, run to Morian and Yewan. Follow the elders. Wait until they approach the tree and pass on.
Jump down and defeat the beasts. Go to the meeting place with the elders - do not interrupt them and wait quietly. If you are exposed, you will lose -1 reputation with the Natives. After meeting with Dunncas and the elders, the mission will be completed. You will receive 1000 XP, +3 reputation with Aphra.