Personally, I’d go with Isarnia to add defense down to your roster. I mean, I don’t doubt you’ve got a maxed Grimm, but Isarnia’s debuff is much more powerful. & Adding the fact that you could one day pull her costume, which would permanently increase her stats, helps make that decision all that more simple (in my mind)
I mean I love Frida, and she’s more fun to use in raids [than Arthur] with a hit three and dispel three, but with already having Arthur maxed, I just don’t see a reason to max her solely for that.
& Magni is awesome too, but you already have a couple of snipers maxed in blue, so again, not as vital.
Then there’s Aegir, who makes a great tank and is alright on offense for survivability, but idk, unless you’re in desperate need for a solid tank, I think I’d put him on the back burner, too. Not a huge fan on him on offense, cuz even though he helps your team survive a little longer, the heal is so minor that I’m usually regretting the fact that I didn’t just bring a better healer with me, instead. & With him being 100% passive, you don’t get nearly as many benefits [maxing] as you would with any of your other options, considering the rest need to hit 80 (in order to max their attack stats) to be of the most use on offense [with their attacks].
So yeah, that’s my vote (and reasoning), and to order it:
- Isarnia - for defense down, and potentially a costume bonus in the future
- Aegir - if you need a tank, or enjoy using him on offense for the added survivability
- Magni - because his attack stat maxed is no joke, and makes an excellent sniper (always a good thing). Plus, he’s the only one of your options that needs to hit 80 to be of any use; the rest have solid enough secondary effects that allow them to be of use even at 3/70 (aside from Thorne)
- Frida - because even though she’s awesome, dispelling and dropping elemental defense, your maxed Arthur covers half of that already
Wouldn’t bother maxing 2nd Arthur, 2nd Isarnia, or Thorne til all of the above are already maxed (personally)