I do have a pair of further questions regarding masters.

Are there any magecraft off limits? I'm going with Earth/Metal stuff for my master's primary magecraft, but I'm wondering if there's anything I should avoid if I wanted a second focal point. Also might need help with origin stuff, wee.

Additionally, are FCs that might have elements that make the person seem not human permitted, if its noted to be cosmetic or otherwise? Asking since one of the FCs I'm looking at has horns, but could be chalked up to surgery(kind of scary but in line if I go the Blood Iron Princess route for this idea of mine(don't worry, just a master with a bit of an ego)), or just a costume piece. Otherwise, I'll keep my eyes open for a suitable FC that works. Red hair can be weird to work with sometimes. Also guess this is a third question, but is there an upper limit for how old a master in the city can be if a player character? I'm not planning an old hag master, young, but I was thinking early adulthood range.