Went after Lakshmi first since my dark physical is much stronger than my dark magic. She proved to be a massive pain in the ass. It two hours to win with 35.XX, then another two hours to sub-30 with a time of 26.72.
Team:
Riku (LM2+LMR): R3 Dread Weapon, R3 Reaping Scythe, Swd DMG+ RM (USB/AOSB), double dark boost
Ignis (LM1+LM2): R5 Wrath, R4 Entrust, DMT (BSSB)
Seifer (LMR2): R3 Mark of Darkness, R2 Dread Weapon, Mako Might (CSB), double dark boost
Elarra (LM1+LM2): R4 Ultima Weapon, R3 Dispel, Ace Striker (USB)
Sephiroth (LM1+Lm2): R5 Life Siphon, R4 Crimson Cross, Scholar's Boon (USB2), single dark boost
Magicite: Shadow Dragon (+L15 Empower Dark), Manticore (L15 ATK Boon x2), Necrophobe (L10 Dampen Holy), Hades (L15 Healing Boon), Evrae (L10 HP Boon)
Rough turn order:
Riku: Dread Weapon, Reaping Scythe x3, USB, Reaping Scythe spam, AOSB after chain refresh
Ignis: BSSB, CMD2 Riku, RW, CMD2 Sephiroth, CMD1x2, CMD2 Sephiroth, entrust Riku
Seifer: Mark of Darkness, CSB, magicite, Mark of Darkness spam, refresh chain as it runs out, Mark of Darkness
Elarra: Dispel, UW x2, USB after Poltergeist, UW spam, USB after Poltergeist
Sephiroth: Life Siphon self, Crimson Cross to trigger trance, Life Siphon, USB2, Crimson Cross x3, USB2, Crimson Cross
I can't even tell why I won in my winning run. In the previous two hours, something went wrong somewhere - randomly I don't do enough damage to get out of Phase 1 before Entice. Sometimes in Phase 2, I lose Sephiroth after turn 3 Holyja because a Regenga tick didn't kick in. Sometimes I don't get to fire off Seph USb2 before chain finished. The timing on everything seems to be extremely tight. It reminds me of when I was trying to sub-30 Tiamat, actually.
I'm only going to do this two more times for now then park this up until I get better dark stuff (or at least Seph AOSB). Four+ hours to get two copies is waaaay too much work.
Also, where's my goddamn wait mode DeNA? In this fight the initial turn order is completely random! About 60% of the time it goes Riku -> Ignis -> Sephiroth -> Seifer -> Elarra. But sometimes, Ignis goes first, and about 50% of the time, Seifer goes before Sephiroth! How am I supposed to learn the fight like this?