The only tricky part was getting Cnoc's debuff to land on both main DPS servants. Kuro would be the ideal buffer for this setup, but I'm not sure she'd enable enough damage. Support pick was Oberon.
I think Mecha Eli (or Mk.II) is the only servant in my roster who could've taken out the first bar, and Cnoc's Party wide Attack buff, despite being RNG, combined with her NP damage buff is probably the biggest steroid i could've given her and Sitonai. I used all the buffs immediately so if the debuff whiffed I could just restart (had to 5 times before it hit both). They have nothing to forgive. Gil and Sheba were picked since both have party wide Attack and Arts buffs and i was certain both would have strong enough NPs to take care of a guts each.