1. Fort Joy Ghetto - Magister Yarrow
2. Fort Joy -Yarrow Flower
3. Fort Joy - Migo
On one of the defense walls right by the entrance to the Fort, you find Magister Yarrow. After you interact with him, he will ask you if you have seen Migo - her companion. Regardless of how you will talk to her, she tells you to find him and not return until you have any information about him.
Below, you will find all of the available scenarios for this quest.
Fight with Migo
Migo  can be found in a blood pool on the beach near Fort Joy. It turns out he has been turned into a monster devouring carcasses. He will not attack you until you decide to talk to him.
Migo is a demanding opponent who, apart from dealing high damage in melee can also use AoE abilities. The fight may cost you quite a lot of your healing resources, but you should be eventually able to defeat him. You find a ring and a helmet on him.
Take the ring to Magister Yarrow. Regardless of whether you say that you killed him or lie, you have to prove you are telling the truth by showing the ring. It is important for you to have it on you. After the conversation, this quest ends and you will obtain experience points.
Reward: 300 experience points
Bring the family together
The second variant of this quest is possible only if a member of your team possesses the Yarrow Flower . One of these plants can be found in the ruins near the tower, where you get to meet magister Borris. If you have any difficulties finding it, press left ALT to highlight it.
Start your conversation with Migo and give him the flower, using the appropriate dialogue option. The beast will confuse you with someone else and he will give you the ring. Return to Magister Yarrow and tell her that you have found her companion. After you show her the ring, you will be rewarded and the woman will go to the beach to find out if you are telling the truth.
If you follow her and talk to her on the beach, she will give you a key, which you can use to open one of the doors in the Fort. This will end the quest.
Reward: 2 guaranteed rewards and 3 to choose from depending on classes in your team