Moon Halo comes from Honkai Impact 3rd, the action game where it serves as a Valkyrie theme tied to its central heroine and her most emotional story moments. Fans began sharing short excerpts in character edits, AMVs and gaming montages, where the soaring chorus became shorthand for resolve and rebirth. Because the melody is instantly recognisable to players, it still works as a quick emotional signal in new edits, even for viewers who have never played the game.