This mystery can be found on a large island in the west of Hordafylke, AC Valhalla.
How to Complete Fly Agaric in Hordafylke
This is a simple Fly Agaric mystery, but it can also be a tough one if you’re not prepared. Once you interact with the mushrooms, you’ll be fighting a combination of King Harald’s warriors and Jotnar warriors. Most of these you will have faced before at this point, but perhaps the most deadly is the Jotnar Madman. This mob will spam fire attacks at Eivor which will inflict a significant amount of base damage, but also continue to inflict damage over time with a burning effect. Be sure to take out the Madman as soon as possible to avoid taking too much damage over time. The Jotnar-Guld is perhaps the only other enemy which could cause a problem if you don’t counter their superior reach with a bow or a long reach weapon of your own, but the rest of the mobs should be easy to clean up.
Once all the enemies are defeated, the mystery will complete.