Hi there!
My feedback for your music: already, this is by far the best I've heard from you. It sounds great.
But since what you're looking for are the negative points (that's how we make progress) here they are:
The 4 suns of destiny:
Watch out for panning. I think you're using BBC Core. Basically, the instruments are placed like in a symphony orchestra and they balance each other out when they're all playing. But when you play the violins solo, they're too far to the left. You can either center or double with violins 2 (and put them on the right) to get a wider sound.
The sun of nature:
Very good, super super well composed, but the melody is unclear. I can't hum it. You could take more risks in terms of melody.
The sun of water:
The buildup is very successful and works well, but once again the melody is a bit unclear.
The sun of stars:
The beginning is a bit long, and the transition to the wyverns lacks clarity. Caution: the piano plays dissonantly (D# over a D chord).
The final battle:
Excellent intro and bold chord progression, the main problem for me remains the melody, which tends to just follow and mark the chord changes.
All in all, very, very good. The images are splendid, there's a story being told with your tracks. But as I've said many times, you're lacking in memorable melodies.
You've done an amazing job in 10 days.