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I've already made a thread on one instance of this bug related to a wealth chest in Utangard Chasm in Asgard. But now I've observed another instance of this bug. In the Suthsexe Fly Agaric mystery, you have to fight a variety of animals, some of which transform into Jotun. Like the Jotnar in Asgard, they are friendly NPCs (green dot with Odin's Sight) and are not killable, making it impossible to complete this Fly Agaric mystery. They simply aren't susceptible to any damaging attacks.