Yeah, there are for sure more other places to discover in the Orobas Fjords where the level of the enemies isn't so high like in the cave behind the waterfall!
Explore & discover all places you can land and transform in human... try new areas, but save often and save before you go IN new areas... !
And don't forget: in "human" you can go through the magic fields (without dying like it goes in dragonform) and discover/explore the Anti-dragonzones!
Success
