Finished Commander Lorina over the weekend, don't really use Lorina much but hey why not. The spearheads took the longest by far, even though I was farming a lot in places they drop. Got 4 from event node 19 and the last two from 7-7 world mode.
The only thing keeping me from my third 6* is a lack of 2* monsters at the moment. I just need to create three more 4* and I have the maxed-out level 30s already. But yeah, I get a ton of friend points and grind adventure nonstop but it's never enough. I'll probably promote Ravi, since they're buffing natural 5* and nerfing Tieria I'd like to get her back into my regular team. And she seems like she'd scale well with the extra stats. I use Achates in every team, I just don't think the benefit of a 60 healer would be as noticeable.
I'm starting to get pieces of the T5 lifesteal set from Abyss, and while I prefer Ravi with attack/crit, the stats on this set are amazing (hp%, crit%, attack%, speed). So I'd probably put it on her then move her atk gear over to Lorina.
I beat floor 53 over the weekend by the skin of my teeth, Sven revived after an Arky barrage and one-shotted half the team. Yuna had about 2% hp remaining when his barrier expired and she could finish him. But 54 seems impossible. Round 1 is bad enough with exploding mushrooms, but the second wave is like fighting an arena team that has cheats turned on. It's got regular Purrgis, Kluri, and moonlight Coli along with a buff/heal crystal. Kluri spams provoke and self-heals so much there's no point even attacking her, and Purrgis has a 100% AOE counter that reduces combat readiness so bringing Yuna is suicide. Coli stealths constantly and appears to simply one-shot anyone she attacks once her special is charged. I don't think this is remotely beatable until they nerf Abyss in the next patch. Maybe if I had a defense buff, but I don't, and even then bringing Armin doesn't help at all. She just gets chewed up while my healer is permanently provoked (nevermind Achates has elemental advantage over Kluri with tons of effect resist).
Hopefully my eternal bad luck in this game turns around soon, I'll have around 500 bookmarks ready for the patch. I'm sure Krau will just be bait for some limited Christmas hero though.