Heyo, here to judge.
Straight away, sound library quality is through the roof (the choir sounds greatttt), plus the subtle layer of organic + synthetic is always a great texture; the call and response between the choir and the horns is neat and well-integrated.
I'm hearing quite a lot of time modulation, they work really well individually. The 5/4 section being this mellow is quite interesting, especially this early in the song (the minor 7th chord in there is really odd though, it's a bit too jazz-fusion-ush for the vibe you were going for imo). The strings arpeggio with the brass screaming on top is great, but I don't like how it gets cut off at 1:15 abruptly: in general, everytime we go back to that section, there's always an awkward jump which I feel could have been polished more. It is quite an imperial composition, so I understand how difficult is to make all transitions work.
The orchestration is absolutely legendary, fantastic job with the strings and the brasses and the woodwinds, the melodies are too notch in creating tangible tension and mystery.
Mix-wise the volumes are on point, but I'm hearing some distinct clicks (not sure if that's because of an incredibly fast attack from the violins, but it's pretty distracting nonetheless) and in one or two points the peaks clip a bit.
As for bossbattle-ness, I think it could fit, but it really needs some more driving rhythmic elements.
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Restlessness check: 11
Possibly 
