I was confused for a bit about the Lux Nail/Waki issue, since it's right there in the script that checks attacks:
https://i.imgur.com/xWlGR50.png
Can you spot the issue?
As for the other things:
- Clearwell should now apply regen properly.
- Nihil's a bit of a funky weapon in general, but it'll at least now only hit once [for a bit more single-hit damage, too]
- The shield issue was due to some things being ordered wrong in the status menu. The shields do what their descriptions say they do.
- I still don't know what's going on with the Changlins. Enjoy??
- There's supposed to be something blocking you from going down into the pool until the absolute end of the game, and now it'll actually do that.
- As for the last set of classes, I added a book in Naus that should hint at where you need to go in order to change into them. Failing that, there should be one cave on the overworld you haven't gone to yet that'll let you change into them.