The following chapter provides a detailed description of the gameplay during A Curious Proposal. You will find tips that can help you complete the quest in the most effective way possible.
Starting the quest
You will activate this quest after a conversation with Fernund in Brightamarket. He will assure Aloy that an artifact has been hidden, and she can obtain it if she investigates the site.
Head to the location marked by Fernund. Activate Focus and you will find a chest on presented shelf. You shouldn't have any problems to get there. There are many handles in the area, which will help you climb. Investigate the chest.
The chest is empty and the whole story was a lie. Fernund brought some friends that are supposed to help him kill Aloy. You can kill them all or escape. There will be six opponents and you will face them in two phases. They are immune to strikes and arrows, so aim for the head to eliminate them quickly.
Regardless of the fact whether you decided to fight or run away, you will have to track Fernund, who took shelter in Meridian. Head to the place marked by the indicator. Once you get close enough, you will surely hear his voice.
The last part of the quest is to talk to Fernund. Regardless of your decision, the task will be completed and you will receive your reward.