I have played PS4 many, many times, and the part when Alys dies is very dramatic, very sad.
When I heard this song, I knew it was THE remix I was waiting for about this part of the game : quite "simple" (don't take it the wrong way), with soft instruments, great transitions... If I played the first time at PS4 with this music when Alys died, I would have cried.
This is truly a great requiem, and I swear it won't move from the top of my playlist for a long, long time.
I don't really care about the technic when hearing a music (especially from this site, I have yet to find a bad quality music), and I think I have heard remixes far above this one technically speaking, but the emotion I feel when hearing this one is better than a good drum loop
(please don't care my weird english writing)