Well, I did get pretty far on my latest attempt.This time, on expert. I know right, Wizardry 7 Ironman expert, what am I thinking...
6 Faerie Monk/Monk/Ninja with three Priest-Bishop-Priests. They one-rounded the Magna guy, double Spawns were a joke, even double Godzylli were a joke, went all the way to lvl 25 ... then wiped on an unlucky group of Tshober's demons. I had that guy on farm status, 2-4 groups at a time, then boom, 5 groups of 5-6 each. A few fizzled Astral Gates were involved, followed by about 30 Firestorms/Fireballs...
So. Magic Screen and Fire Shield just aren't enough. Fire resistance is really really good for the late game. Who knew.
Of course, the only way to get large amounts of it is through plate +3/+2 and chain +1.
With that in mind... new party!
Human Ranger->Ninja->Valkyrie
Human Ranger->Ninja->Valkyrie
Faerie Ranger->Ninja
Human Alchemist->Ranger
Human Priest->Ninja->Valkyrie
Faerie Mage->Monk
That gives 3 characters who can use the Plate +3/Plate+2, and in the event that a Dragon Kite drops for the back Valkyrie, the ranger can roll with the Chain +1. Otherwise can split fire resist gear so all 4 non-faeries get +30% Fire/Cold.
Ultimately, this setup allows all 6 characters to have 115+ Hypnosis, Psionic and Lifeforce resist, along with respectable Fire/Cold resist. They don't need to resist fire spells all the time... so long as they're not taking Firestorms directly to the face each and every time.
(Unlike the Lord, the Valkyrie and Ranger have Tier1 saves, high Hypnosis/Psionic/Lifeforce which is really all that matters. Besides Fire Resist, I mean.)
Ninja will roll with Gown of Divinemail for the Lifeforce and Golden Medallion for the fire resist. Along with -25 AC and 'Death' resist from Gown, +60% Poison resist from Coil, 30% P resist from Paw, and 50% Light from Necrohelm, he'll soon become the team's big game hunter of Godzylli/Gorrors.
Not sure what to do with the Faerie Mage/Monk though. All he really needs out of Mage is Fire Shield/Magic Screen/Armor Shield... could go Human Mage->Samurai, I guess?