Place this clip at the turning point just before the assault begins, then follow it with the Inception horn sound button for scale and an enemy spotted sound button when opposing forces appear on screen in your edit.
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This is a three-second spoken line where Horus delivers the phrase 'Let the galaxy burn' as a Black Legion battlecry in a deep, commanding voice. It feels menacing and defiant, like a final declaration before an all-out attack. The clip comes from the Horus Heresy trailer.