So there's one minor snag in my Arena plan. I thought Kali didn't go for her instant kill below 70%, but it's actually 65%. The best gravity that's inheritable as far as I know is 30%, or at least the best one that I have. That's not a deal-breaker, but it does make things much trickier. If I did my math correctly, I need to hit Kali for 3 million damage after the gravity (1.5 with Charite), which isn't too tough. It kind of necessitates that I don't use a ton of actives on finishing off the previous floor though, which means Athena most likely is a loss and Beelzebub might be.
I also have to rethink putting gravity on Reine, since I may need her to burst. May have to put it on Snow White instead, which is fine. I'm not going to skill it up so there's no chance of accidentally stalling into it at the wrong time, so there's no real risk to doing so. And if I get all red resists I can actually tank Kali's insta-kill provided Charite is up, although I haven't done that yet.
Actually wait, does Kali's turn-one shield also protect her from gravity? I think I've heart of people using gravity to bypass it, but does that actually work? If not I'm still good, I can inherit Healing Miracle onto someone. If that's the case I can probably even start doing runs tonight.