Assassin's Creed Valhalla- Mastery Challenges 2: Dawn of Ragnarok Required???

Will you need the Dawn of Ragnarok Expansion in order to finish off the Mastery Challenges part 2? Do the 3 doors where we obtain the "Odin's Eye" represent Jotunheim, Asgard, and Svartleheim? Is this a plot to get us to spend some cash if we wish to unlock the secrets?

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