Originally posted by brown29knight:

I've seen hints that Odin may not be happy with your progress... I'm wondering if he may be the final boss. (or the option to betray him, and thus he becomes the final boss.) If so, Asgard may be the final "biome"

Probably this (not the biome but the final boss). And thinking of how we're supposed to kill the forsaken ones for him, he'll probably be a oneshot if he needs help with eikthyr.