Well finally decided to try out Machine Hera and on my 2nd try...
Oh, so close:
My comboing was terrible on that one as there were a few too many water drops on the board after using Scheat.
So I used one stone on my main (which I got back after clearing it) and finished her off.
edit...
My main team is easy to see, but my sub team was Neptune, Orochi, Rukia, Ryune, and Shinji-Scheat.
Neptune let me get past floor 4 Sadalmelik pretty easily and stall for turns. Used Orochi #1 one on floor 6 to wait out the water guy's water absorb and not have the light one reincarnate. Used Orochi #2 on floor nine to slowly work him down. I had MHera at about half of her HP and had to stall a bit as she kept delaying my skill turns and then having water absorb back to back...Finally got a chance to attack, but just didn't combo very well...
First try thought I could stall for turns on floor 5 with Mar Midgard, but didn't check out the MHera floor guide and died on his +280k super attack, which even with my 75% damage reduction was too much.
Anyway, glad to have her. Now I'm debating on whether to hyper her on both of my accounts to use for multi or just use her for fodder for YomiDra. (I still need to clear Hera Dragon, which I missed playing the last time it showed up as a guerrilla dungeon.)
I also want to try/clear MZeus for my RaDra. Would MHera make MZeus easier?
edit: Tried MHera again and this time I was able to clear it without continuing, yay!