Fight:
Repeat of Imps + Soulflayer (main NM).
Imp Moves: Dark Recital (full aoe dispel, paralyze), Grating Tantra (Aoe Amnesia), Potent Lunge, Diamondhide, Enervation, Aeroja, Overthrow
Soulflayer Moves: Azure Lore, Tribulation (very potent Bio AOE), Immortal Mind, Blue Magic spells - Droning Whirlwind (full aoe dispel; can be used even without Azure Lore active), Mighty Guard, Subduction, Uproot.
Gimmick:
Soulflayer uses a shield move that negates most damage sources. SMN can break it with Volt Strikes, but the gimmick appears weapon skill damage can bypass it (whether from pets or players), whereas most normal attacks cannot. Shield appears to have TP-Drain spikes as additional effect. Critical hits may also bypass the shield as well.
Theory: two highest enmity players can break the shield (
need clarification on this)
Soulflayer is able to upgrade initial shield to a "double shield", negating all forms of damage (
need clarification on this)
Imps take increased piercing damage.
Fight usually starts off by picking off each Imp until all are dead. Generally, ranged strat works well (COR x3 OR mix of RNG+COR), as AOE damage becomes quite harder to deal with once they are dead and you're standing in range. Spike damage will pull hate from tank likely, so a well-timed skillchain or hate reset source may be useful.
The Soulflayer has access to "Droning Whirlwind", a full AOE dispel move, and uses "Tribulation", which is a very potent Bio that needs to be removed asap, as it's something pretty insane (like 500+ HP/tick or something iirc?), though it can be resisted. Standing at max shooting/curing range works best.
Conversation is here, with several videos:
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https://www.ffxiah.com/forum/topic/48624/ambuscade-findings/23/#3204848