The Relic Song being a special song in Blur/Blight canon and almost every AU ever with the exception of Numeron Code- Relic Song is just a personal song that Slater taught to Piper. It only becomes special once Piper becomes a Number Hunter, and that's the haunting melody his opponents hear him whistling before they duel for their life and he steals their souls.
Aka it's Haruto Tenjo's theme. And it gets whistled too.
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