Hey everybody, I'm looking for some help. I'm trying to finish that challenge that requires 3 master builders (trying not to spoil here), and I have 4 people who are at adept builder level, maybe 1 or two increments away from master level.

I have been exercising (3Xred stew) and fixing huts with them for about 10 years of game time, and they have not increased their skill level at all (despite seeing "this villager has improved at construction" probably 500 times.)

What's the deal? They are all getting quite old now, and I don't want them to die before I can get them to master level.