Went after Izanami with a variation of the team I saw on
chinese pad.wikia:
Awoken Odin
Hera-Is
Zeus
Vritra
Lucifer
Awoken Amaterasu
Only my friend's leader had plus eggs. Really safe team as long as your HP is around 19K for Mythical. For most of the dungeon you charge up your skills every round and then use the two Gravities and Lucifer to finish off foes when they are at half health or less up until you get to Izanami (however on the first round don't use Lucifer to finish off the second/last demon otherwise you will get killed by the preemptive attack by Divinegon in round 2). Once you get to Izanami (hopefully it's the light one) I would say wait until 40% and then unload the gravities, Lucifer, and finish her off with Vritra and Odin (Odin's move now having the ability to heal is incredibly useful for the entire dungeon but make sure you don't use it before Vritra).
Dark Izanami can be done the same way, it's just the poison orbs and orb movement limits really make this battle much longer than it had to be.