When that one motif from earlier in the game reappears in a boss fight, like their past is screaming at them:
seen from Kuwait
seen from Pakistan
seen from Japan

seen from Malta
seen from Netherlands
seen from United Kingdom
seen from China
seen from China

seen from Malta
seen from Belarus
seen from Germany
seen from Germany
seen from Türkiye
seen from United States
seen from Netherlands
seen from South Africa
seen from Israel
seen from Brazil
seen from United States

seen from Indonesia
When that one motif from earlier in the game reappears in a boss fight, like their past is screaming at them:
the ultrakill ost is spoken so little of, it makes me sad
my personal favorite is a song called: order
(A couple of warnings: the music gets a little intense at times, and don’t get scared by the icon, it’s kinda disturbing so some)
Requiem leitmotif in Requiem: Behold, the beauty and wonder of humanity's accomplishments
Requiem leitmotif in Order: Humanity's failed savior returns, desperate to right his wrongs all those years ago, an impossible goal he will never achieve.
Requiem leitmotif in War Without Reason: All the death, all the destruction, these horrific deeds will forever stain the legacy of humanity, still wreaking havoc on what little of a world is left.