So, okay, still kind of confusing, but nudging in this direction:
Scarred and then rejected by his father, a prominent military commander, when he wouldn't follow in his father's footsteps, Varrin Ebonlocke wants deeply to escape his life and the hinterland village in which he lives. But that escape comes in the form of a raid by a band of quasi-human savages and news of a prophecy of the elves, a foretelling of coming war from lost races in the West, that seems to center on him and his equally troubled twin brother Arrain.
So that's the first part maybe. For the other parts, I'm not sure what to suggest for putting next. You have three things -- that the elves cannot fight (due to the curse) -- do the humans know that part?; Arrain's vision/spirit encounter, which turns him toward insanity and which shows Varrin might become the leader of the enemy, dividing the twins; and Varrin's encounter with the blind elves where he learns things are more complex and his discovery of the needed object. You can possibly put the first and third together if the humans don't know about the curse re the prophecy, and it's Varrin who finds out this information. But if not, then it might come earlier. The second point probably should come before the third, so you have that Varrin may turn evil, oh wait, no he just found out the truth bit. But, you could also structure it the other way around. (Sounds like Varrin's plotline comes first?) It should take about two paragraphs.
If there aren't a lot of warrior characters, or at least a few who are prominent, that might be worth a brief mention. You have a fairly straightforward central plot structure -- journey, fork into two plotlines, so second paragraph can start with trip north and go into one of the brother forks, third paragraph covers the other brother's fork. The plotlines tear them up, so you want to present that.
That paragraph about the weight of battle, I think you could keep some of it, but it could be dropped to a concluding sentence. It's hard for me to judge what details are key besides the shock each brother goes through, since I don't know a lot of them.

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