Ultimate Hera Rush!

sandbaggin' Ra with that 77782 HP on Extreme King

Solo'ed mythical plus with a slightly modified Xiang Mei team.

Xiang Mei (inherited skill of Honest Insight)
Scorching Dragon Angel, Uriel
Enthusiast Red Dragonbound, Gadius
Enthusiast Red Dragonbound, Gadius
Awoken Astaroth <-- she's a bad fit overall, but carry her w/o using her active until F7
Xiang Mei (Inherited skill of Shine Flare Ring)

50,141 HP (everyone +297 except Astaroth) so F6's 46,238 preemptive is tankable
Be sure to set the team's awoken badge to Bind Immune
Everything except F3 is a Devil, so Gadius' devilkiller awaken means he's extra valuable here.

F1: Stall a turn or two to get some skills up
F2: Team's 80% skill bind restistant, so the preemptive *probably* won't be a problem. Use Gadius, then Uriel to one-shot her.
F3: Use up to 2 turns to set up a heart/fire rich board and/or pop a skill. One-shot 'em.
F4: Keep her >50% HP, and you can stall until all skills are up. Use a skill, then one-shot her.
F5: 80% SBR didn't save me, but stalling 5 turns was easy. Got lucky enough to have at least 3 hearts drop each turn. Took the time to set up the board and one-shot her while fully healing before facing F6's preemptive. (hurray XM!)
F6: Gadius' AS, or Shine Flare Ring from friend XM --> kill and heal
F7: Astaroth AS (counterattack is the trick here!), then Gadius, then Uriel, and my XM's Honest Insight skill. One-shot the boss! Their resist leaves them with one HP, then they hit you for 95% of your own HP...automatically activating Astaroth's counterattack --> win

The trick to beating the last floor is to bring gravity. When you arrive on floor 7, do enough damage to kill him. Zeus will activate his resolve (will be alive with 1HP), and Hera will activate her skill to heal Zeus back up to 50%. At this point, use gravity to bring ZH below his 50%, removing his resolve, and then he is safe to kill.

My trick to beating zeus & hera is to bring a skill like gungnir (Nx attack against single/multi target).
First turn, wallop them to trigger their resolve. They hit me with gravity, then heal to 50%.
I use gungnir to bring them below 50%, then I don't have to worry about resolve. Smash them again for the win. Gravity works, too, as austin pointed out.
I like this method better than gravity because the skill takes fewer turns to charge, so I can usually use it multiple times per dungeon. Gungnir can heal and remove binds on top of doing damage, so it is my go-to for a lot of situations. I'm still a big fan of gravity. I just haven't had a use for it lately. Maybe the meta will come back around and make my grodin/amaterasu team relevant again. Z&H were great on that team.

This would be a great dungeon to run a jammer team, Hera-Ur's pre-empt jammer skyfall will last the whole dungeon as long as you don't pop a Fenrir and overwrite it :P I was thinking:

Algedi G/L leads
Hanuman [Fenrir Viz]
Urahara
Verdandi
Ganesha (for Hera's 40k pre-empt and to complete SBR)

Unfortunately none of my friends or randos ever run Algedi so I just defaulted to curbstomping this with dAthena, Anubis counter on boss :B

Just tried this with the "one shot boss then use gravity " approach but they used gravity on me then did a small follow up attack and I died. Beware.

This dungeon is not for the lactose intolerant.

So this dungeon now gives from 288k to 321k exp per run~ :D And if you play coop, that's at least 5,760 exp per stam. Pretty crazy~