Blue crystal

at the beginning of week 2, month 4, I finally finished off the enemies. First, I killed the dwarf from pair 5 , and immediately went to his portal. It's located in a very inconvenient spot, right next to the spellbook library, which I think makes it very questionable whether you can even reach it when enemies are surrounding you from all sides. It needs to be moved at least so you don't have to walk through the water to get to it. The garrison was defeated without any problems , and then the dwarf from pair 6 . Now I'm going to the prophet; I assume I have to swim to get to him too?