[Coda]

I'm currently running Legend (not Mythical) with this team:

Permafrost Queen Hera-Is (1.5xHP 2xATK 1.5xRCV to Devil, 2xAuto-Recover)
Pitch Black Night Princess, Lilith (Auto-Recover, Time Extend, and a 1.5xATK to Devil active)
Awoken Hera-Sowilo (best Light-element devil I have)
High Water Ninja (Bind recovery active, high-ATK high-RCV Water-element devil)
Divine Queen Hera (TPA, Ultra Gravity)
Sea Deity, Abyss Neptune (1.5xATK to Devil, 50% damage from Water and Dark, 1.5xATK to God active (which works for 4/6 of the team)

Poison actives on this team = Lucifer is going down after one round. :P (EDIT: Derp. Lucifer has status ailment block.)

Team's working pretty well for me. My real worry is going to be Hera-Ur-Senpai's "Now I'm mad!" because she uses it while she's still Fire-element and will do enough damage with the follow-up attack to one-shot me on Mythical. I might need to use a single stone there if I can't burn her hard enough to get her into Dark-element before she can land a hit with it.

I accidentally brought the wrong team into Master -- a draft of a different team for it that was intended to be a Healer-based team instead of a Devil-based one, using Chaos Devil Dragon as a leader and then stacking lots of RCV and Light-element damage with healers... except I forgot that this was the team I had built, and grabbed Neptune as if I was bringing in my Devil-based team. That was an EXCEEDINGLY slow grind. >.> FORTUNATELY, 75% damage reduction vs. Dark made it pretty safe except that I had to use a stone when I flubbed a heal against Hera in Fire mode.