One shotted both Hera-Ur's crazy....
Shinji+Kaoru + Double Lucifer made this a stressful but very doable dungeon... Yes, I got incredibly lucky too... I ended up using Shinji 2x, and Lucifer 3x.
Lucifer #1 while Round 2 was still light before it switched to red.
I "delayed" during Round 3 to get as many cooldowns up before heading into round 4.
Whittled down Minerva using -Armor and Baal Return dmg until just a sliver of red was left while Lucifer was recharging then...
Shinji #1 to instakill Minerva and go to round 5
Tried to do as little dmg as possible while maximising combos to get healing... until Shinji and Lucifer were both ready... then starting working Hera down to as close without going over... (she does anywhere from 7k to 24k dmg per turn during this phase)
Shinji #2 to deal 600K and switch her to dark... (she does from 7k to 34k dmg during this phase)
She hits me once while my rainbow keeper was still up for 14,000 leaving me with 702 hp... and reflects 150,000 dmg on herself ... HAHA.
Lucifer #2 to deal 300k dmg, putting her below 25%... She pauses for a turn getting ready to deal 120K dmg per turn... uh oh... but gives me enough time to heal up... and
Lucifer #3 for great justice and the win.
Muahahaha
If i were to do it again, I would bring a different setup... but this was the best I could do with what I had...