As for the mountain, the idea is that once you've explored the entire area around it and realize that there's definitely no way to get to it (your version), you need to go back to the mage in the tavern of the underground city for advice, and he'll tell you about plan B.
As for the mountain, the idea is that once you've explored the entire area around it and realize that there's definitely no way to get to it (your version), you need to go back to the mage in the tavern of the underground city for advice, and he'll tell you about plan B.