I'll probably need to revise the combat rules after this.
Hmm, I feel like this is something with two worlds with very different combat philosophies interacting with each other.
While I don't understand much about Exalted, from what I do understand, warfare centers heavily around the superpowered Exalted, with dedicated combatants being able to scythe down more-or-less arbitrary numbers of regular troops. This is shown by how the effects of Might are multiplicative. Which I think is a good representation.
Warhammer meanwhile, is something where while characters can be potent force-multipliers, they need forces to multiply. Sure there might be a living force of narrative that makes for a nigh-unstoppable one man army here or there (see Tyrion or Gotrek), but for the most part in Warhammer Fantasy, "He's just one man!" is a pretty spot-on assessment. Malekith is a genuinely dangerous combatant and a lethal sorcerer, but if you could prevent him from using one of his many (many,
many) escape options (which include having a fracking Dragon) and mobbed him on foot with heavy infantry...well then he probably dies.
I think this contrast in war doctrines makes for a good part of the entertainment of the narrative, but that is something I feel should be acknowledged and find ways to validate
both approaches as having their own strengths and weaknesses.
Though for this battle specifically, I think the big thing is that this was a rather odd Dark Elf army, and still a quite weak one. There was, to use the Tabletop turns, barely any Core and basically all Specials or Rares. There were none of the regular Dark Elf citizen-soldiers, instead the bulk of the army was 100+ Har Ganeth Executioners, 40ish Black Guard, and the Hydra. So the Dark Elves were outnumbered several times over even before the Eidolons.
Maybe future major battles could have a thing where each army needs to have a Core? That is, each side needs a large-Size formation that makes up the main body and frontline (for us this would be either General Troops or Eidolons as having the necessary size.) This would help quite a bit I feel, because Dark Elf rank and file Soldiers would be Quality 1, Might 1, which is actually
better than our General Troops 1v1. I can't really think of the exact mechanics for this, but I think it would be helpful in providing a good challenge where Exalted needs to rely on its powerful heroes and force-multipliers to tip the scales back in their favor.
Right now we're still in the early stages dealing with whatever local troops were around rather than serious efforts by major Druchii powers though, so I think it makes sense that things are still fairly easy. And them being easy means we have time to experiment.
