The Underschool doesn't get referenced often. Magister Aspen knows very little about it and has a lot of other stuff on their mind.

As for monsters, there's a few places to look for those. Perhaps she'd like to read this Bestiary page, which lists creatures such as the Rat (edible in a pinch; full of useful body parts), Croa (a crop-devouring pest of a flightless purple bird, but also full of useful body parts), Gremlin (a pest that appears in cluttered places), and Ooze (a pest that appears in grimy places).

...it's a pretty sparse bestiary.

Actually it almost looks like Magister Aspen was interrupted in the middle of writing it, because the next line after Ooze starts "Medd" and then trails off.

That's maybe concerning. She's concerned. Wonder what happened to Magister Aspen, honestly. Probably nothing good.

Regardless, she's going to keep supervising further training. They need to get good enough to face the Underschool before they can finish the tower, and they need to get the other girls apprenticed before they'll stop be bottlenecked on Sable's time for nearly everything.

Is there anything on what the fog is or where it came from?