These were 2 novels that seemed meant to be part of a trilogy. I believe the author was an academic, maybe a professor, with an unusual name. The 2 books were published years apart, the first one in the 80s, maybe even earlier, and the second in the 90s. Main character was a young woman who traveled as a mapmaker, part of a highly respected & fairly powerful guild. There were "wizards" who seemed to use advanced technology that seemed like magic. There was another main character, a young man, who wanted to become a wizard and figured out how to make gunpowder. There was an alien race that lived beyond a kind of dead zone, who lived in kind of a hive-like community. They communicated using shape blocks that the females produced from their bodies. The males could only "speak" if they collected these blocks to use. There was another male character that used a boat to find these creatures. The boat had to have a copper bottom because there were tiny snails in the water that would bore through the boat below the waterline