Okay, here's what I've got so far, with
@Crake's recommended distribution of Legion forces. I've reduced the auxiliary forces committed to the reserves in order to beef up the other fronts.
Heavily shifted servitors to the Center, but kept all of the Sea Drake servitors on the Left. Their Sunbursts will no doubt be useful, and as
@Archibald pointed out, their Ball Lightning breath weapons will be helpful to shut down the Profane Regeneration of the Nemhains. That's why Waymar is over there, too.
The Devouring Mist swarms are going to resist most of the Sunbursts our servitors throw at them, but a lot will still get through their SR, and even those which don't will do a nice job of burning down the less resilient Undead.
Getting rid of the Devouring Mist swarms is going to mostly comes down to Viserys, the Companions, and AoEs like breath weapons.
1st, 8th and 9th in the Center, 3rd and 5th on the Left Flank and the 6th and 7th held in reserve. Place around 3/4ths of the Heavy cavalry on the left flank (5,000), with around 1/2th the Light cavalry (3500
[X] Center, with the 1st, 8th, and 9th Legions, the Siege company, and the 96 additional Launcher crews
-[X] Viserys, Richard, Lya, Dany, Teana (Trace/w scrolls), Tyene, Amrelath, Varys and Balerion, Liomond, Danar, Alyssa, Thoros
--[X] 8x Fiery Dragonbeasts
--[X] x6 Veteran Erinyes (each with x30 Gravemarker Arrows)
--[X] x10 Heralds (each with two Elemental Fire Wyrmlings acting as dedicated healers)
--[X] x2 Adult Mind Dragons - The Mind Dragons will be linked to one another via Telepathic Bond, along with the commanders of the Legions and Viserys, using this in combination with their long-range Telepathy to allow for pin-point control of our forces.
--[X] x6 Guardian Nagas
--[X] x20 Plant-Imbued Shadow Creature Cat & x20 Verdant Ravens [Advanced Plant-Imbued Giant Ravens, with Ravens carrying Cats as needed (once their Sunburst and Entangle SLAs are expended, they withdraw from combat)
[X] Right flank, with the 3rd and 5th Legions, concentrating 75% of the Heavy cavalry on the left flank (5,000) and 50% of the Light cavalry (3500), with 50% of the Darkenbeast company (500)
-[X] Melisandre, Benerro, Vee, Waymar (flying this time, like everyone else), Teana (Main), Relath
--[X] Hadhayosh (CR 20)
--[X] x6 Veteran Erinyes (each with x30 Gravemarker Arrows)
--[X] x17 Heralds (each with two Elemental Fire Wyrmlings acting as dedicated healers)
--[X] x2 Adult Mind Dragons - The Mind Dragons will be linked to one another via Telepathic Bond, along with the commanders of the Legions and Viserys, using this in combination with their long-range Telepathy to allow for pin-point control of our forces.
--[X] x10 Advanced Plant-Imbued Sea Drake
[X] Left flank, forces attached to the armies of Sathar with 50% of the Darkenbeast company (500)
--[X] Rina, Malarys, Vee, Zherys and Ceraxes, Mereth, Teana (Trace/w scrolls), Nettles & Sheepstealer
--[X] Bahro (Awakened Adamantine Golem, Unchained Monk 1)
--[X] x6 Veteran Erinyes (each with x30 Gravemarker Arrows)
--[X] x2 Adult Mind Dragons - The Mind Dragons will be linked to one another via Telepathic Bond, along with the commanders of the Legions and Viserys, using this in combination with their long-range Telepathy to allow for pin-point control of our forces.
--[X] x2 Very Old Myrkdreki Dragons
--[X] x5 Advanced Plant-Imbued Sea Drake
[X] Reserves, with the 6th and 7th Legions
--[X] Teana (Trace/w scrolls), Aradia, Diana, Nuri, Glyra, x2 Fey Lords, Morwyn and Tuin, Misfits, Soft Strider, Yrael, Azema
--[X] x5 Veteran Erinyes (each with x30 Gravemarker Arrows)
--[X] x2 Adult Mind Dragons - The Mind Dragons will be linked to one another via Telepathic Bond, along with the commanders of the Legions and Viserys, using this in combination with their long-range Telepathy to allow for pin-point control of our forces.
--[X] x4 Guardian Nagas & Nirah
[X] The Moonchasers and Manticores will alternate between firing explosive shells and Beetle Bombs on large concentrations of enemy troops, especially charioteers identified as having the horses rigged to detonate, while using their +1 Ghost Touch rounds to suppress the Nemhains and any other Incorporeal threats which present themselves. Manticores will use their Energy Siege Shot system to launch Force bolts against targets which attempt to engage them in the air.
-[X] Wyverns will follow the same priority with their Beetle Bombs, while setting their Energy Siege Shot system to deal Force damage. They'll use their Force bolts against enemies which attempt to engage them in the air.