i crashed again at 13 turns left
You may want to learn to use the worldbuilder yourself. My guess is that you have more problems with Mercurian mages. Go in and delete them. If it doesn't solve the problem, you just have to decide if you want to finish or not. Youc an post another save.
There isn't anything more I can do, I'm not a programmer, I can't fix the underlying bug.
Best wishes,
Breunor