vyor,
Tambourine... going to say a few things here.
As someone who is an EXTREMELY old hand at exalt... I think the only one with more experience than me on this forum is
Merior...
I can safely say this...
Exalts are NOT invincible.
Solar Exalts are NOT invincible.
There are things IN the Exalted setting, that would eat any given Exalt with insufficient essence alive.
The reasons why the Exalted won against the Primordials comes down to a few factors; Infrastructure (the Mountain Folk + Autochton geared the exalts up like mad), Surprise (it started with an ambush/assassination of a Primordial's Soul outside the gates of Yu-Shan, and then blowing up the Gateway after the Primordials returned to Creation to prevent an escape), Mortals were weakass enough that they did NOT get geased like other things in Creation because they were prayer machines and so seen as 'harmless' until they got Essence Weaponry shoved into their souls... the war was uncertain until the Exalts SUCCESSFULLY killed Primordials and everyone went what the hell! Fucccck!.... also Theion went full out emo at being unable to protect his followers.
Also, there was the whole respawning mechanism... kill one, another mortal gets the shard and goes back in the fight. Over and over until the target dies.
More than that, back then? The exalts were UNITED; 300 Solars, 300 Lunars, 100 Sidereals, Millions of Dragonblooded, and RETCONNED out of existance unknown number of exalts.
Armed with the best weapons that the Mountain Folk and Autochton could make, trained and equipped by spirits in secrecy.
And it still could have gone the other way... given that in the Primordial War, time weaponry got used and both sides ended up with an unspoken agreement to NOT use that shit.
And even after they won that terrible war that saw a kind of intact ravaged Creation in its aftermath... 3/4rds of it got Retconned away with balefire with entire concepts and things simply gone or never existed... and then you get the whole First Age where they claiming landmass from the Wyld and along the way break reality hard... do MAD! science and stuff...
And then Ursupation, Contagion where 90% of EVERYTHING died (not just humans, EVERYTHING), and then the Fairfolk and the Wyld swept in and washed away a fair portion of Creation before the Imperial Defense Grid kicked in thanks to Her Redness.
This is to give you a perspective.
Creation, as is, has suffered multiple apocalyse.
Exalts are not invincible, they can and did die HARD despite possessing perfect defenses.
Against mortals or not so mortals, their primary effect is that they have nice big dice pools, have charms to make their dice pools bigger, and have exotic effects in their charmset which is basically magic.
And if they fight against something long enough, they'll develop charms designed to fuck over their enemies.
Also, you can kill an exalt... but you know what happens? They will respawn in another human who would likely have a grudge against you thanks to having dreams/memories of how they died... and they can keep coming at you.
The exalt can die over and over, and the target needs to win EVERY time... you can guess what happens eventually when the target slips up.