The Ruin Final Battle OST

I love the music that be used in the Ruin Battle scene and I tried search in ost folder that I purchased along with the game ,but I found nothing even searching on search engine cannot tell me any clues of it or the title's music so I need some help from this post for more information or clues. If you know some information please reply this post. thank you

 

The music for The Ruin is called Crystal Battle 1, the music for The Ruin boss is called Forest Battle 2.

 

I don't have Forest Battle 2 in my OST folder...

 

Either you're not looking hard enough or it got renamed.

 

Nah, it's just that the OST albums actually lack a lot of tracks.

 

Listened to all the tracks I have, but the song is not there. Seems it's just missing. :<

 

I have it in my Experimental Tracks folder. Do you not have this?

 

Maybe it depends where you got the OST from?
I own the soundtrack from Steam and Forest Battle isn't in there anywhere.

 

The newer official OST doesn't have an experimental folder, and deleted many tracks that were in it previously.
Some of these were eventually used in the game, and now we have a Complete OST minus the "complete".

To be more specific, the second phase of the Ruin is a variant of Forest Battle 2.
The original (not used in final game):

The variant (notice around the 0:24 mark a high-pitched synth that was absent in the original begins):

 

You mean the high-pitched synth does actually appear during the battle? Huh

 

I'm pretty sure, anyway. It was a bit hard to hear over the ambient noises of battle, but I do know that's the "newer" version and that would logically mean it's the version used.
Update: I've unpacked the assets and checked. The one in the game files is in fact the variant with the synth.