These challenges are crazy cool, hats off to you. Would you be able to show us the builds you're using, so we can try and replicate it? Also, it's clear that this is done in NG+, hence Mastema, but how many NG+ runs are you doing to get to this point?
Thanks a lot! You can do this as soon as you get Godborn. You can farm stats pretty easily, especially if you've got the Mitama DLCs. I made a video for it. I'm gonna show how to make my builds once I make them final (as in, once this proves to be enough to clear all challenges, because the hardest ones might still be too hard for me with my current setup.) I show the builds in every video, at random times because I often forget lol. So you can also check my previous builds.