I think this is easy with Urd. Urd can let you build a red attacker team with good recovery. I was able to stall quite a bit on floor 5 which let me use skills again on floor 6.
Urd, mitsuki fire fox, ares, nim, ame no azume, Urd.
Fl 1 - Wipe
Fl 2 - Can stall to charge skills
Fl 3 - Orb changers to one shot after stalling get rid of -1 second to move orbs
Fl 4 - Wipe
Fl 5 - Stall until ready to one shot. Easy to hit to < 20% don't do that. Make sure you will one shot. I used Urd.
Fl 6 - One shot after skills are back in two turns. I used mitsuki, ares, nim to one shot.
I have not tried mythical. I don't have a luxury ronia / lu bu team.
Last edited by Frea 6 years ago ( 8.1.1 )