Advance apologies to those who dislike people trying to double-Lucifer ALL dungeons but... this is just one of those dungeons where Lucifer achieves an easy 0-stone.
I used a standard double Lucifer build, but I think it could also be done with Lucifer plus Vampire Lord, Moon Dragon or someone else with an attack/RCV multiplier as long as you're careful with healing.
Build: Lucifer, Echidna, Siren, Hera-Is, Hera, Lucifer friend.
Strategy: Clear floors 1-4 easily, pop both gravities at the start of floor 5 to get her under 50% (so you don't have to deal with the -99% thing). It's smooth sailing from then. Every 5 turns you get a free turn when she refreshes Triple Combination
EDIT: As some people mentioned, be weary of the dark binds from the demons on floors 1-4. Target them first. If you're particularly worried, you can stall on a floor that doesn't have a demon until Echidna is up so that you can use menace after they bind. Another alternative (slightly riskier than the first) is to kill everything EXCEPT one demon, so when it binds and attacks you can still tank the hits (use at your own risk depending on your raw HP and available heal orbs)
Last edited by Kanna 7 years ago ( 6.4.3 )