Moder wasn't hard for me, but the fight dragged on into the night, and the other spawns ate me alive. Multiple drakes, a stone golem, and a pack of wolves, all at once... It overwhelmed my solo play.

Getting my corpse back was an even harder fight, Too hard in fact. I finally quit that world, gave up, and started over.

Bows, arrows, frost resistance, best foods, health mead... and watch the time. If you drag fights out, like I do, it might be worth it to get to the boss area with the eggs, stealth, and wait till dawn to clear out nearby spawns and summon Moder. This way you have all day for the fight.