Scadrial question: When coming up with twinborns, do you actively avoid the incredibly overpowered combinations? Something like pure steel twinborns seem extremely overpowered.
Also, can we get an idea for how many twinborns exist? Is it dozens? Hundreds? Thousands?
I'm going to have to talk about them eventually, but yes, I made some deliberate choices for the Alloy era heroes.
My intent is that they're very rare, but there's this problem in fiction. You can say something is very rare, but if your two main characters are that thing, readers won't FEEL it. So I avoid making too big a deal out of it either way. Either way, I don't have the numbers handy right now.