I love this eerie intro, slowly layering extra instruments on top! It really feels like you've just entered the wrong place. And just when I figured that it might need a change, you changed it up; fine timing on that part. The following section is a great battle theme, with plenty of variations and interesting effects (e.g. 1:45, 1:56) to keep me interested. The song fits the evil "darkness" theme of Yuwall just right. I love the use of a 6/8 (or 12/8?) time signature.
The first and second phase are very distinct (intro and battle), but I have a bit of trouble identifying the third phase. I figured it started at 3:00, but the song seems to go back to the same theme as in phase 2, so it feels more like an extension of phase 2.
Overall, really cool! There are a lot of things here I could see myself trying in the future :D

I like the epic side, there is evolution and variation.

Especially at 2:34!

Well done!

I like the walkdowns with the melody. really cool! and the ability to mix and match the sections so it can be adaptive music is a really great touch that makes me like the composition even more.

Really great counterpoint, theme, and structure! Congrats!

I love the three-phases idea!

Awesome track! Love how it builds and then the drums and bass kick in and the enemy encounter really takes off