I was just about to comment exactly this. Complete with finally changing the difficulty back to normal while fighting Moder.
We also found that Moder’s health was so high that the fight was not doable in a day, leaving us fighting packs of wolves (which could two shot us while blocking) during the night as well.
Moder was so painful. Queen and Yagluth were so much easier in comparison.
Working our way through the Ashlands now and well, what a frustrating area as well. Had to campfire like crazy a kilometer out just to be able to breathe for two seconds without being swarmed. We ended up going kamikaze to siege a fortress for a base and suddenly I can actually play for more than 5 seconds without being attacked.
A lot of Valheim bosses are only difficult because of the massive amounts of health. Without the crazy high amounts of health, none of them seem to have difficult mechanics.