5/6 Carinas done, biggest advice, if you don’t solo Airwalker, just walk away.
I spent like 6k units on the Carinas challenger path because I just didn’t want to start over on a botched Airwalker run. I wound up spending 1,500 units on that one fight. What a waste. If you don’t solo (at most, one death) him, just accept the path is over and start over, I know it’s annoying but it’s way, way cheaper.