Battlesong of the Dark Maiden

Allies within 60 feet who can hear the song, including the wielder, cannot be charmed or frightened, and any such effect is suppressed on them so long as they are affected by the song. Additionally, affected creatures add 1d4 to all attack rolls, damage rolls, and saving throws so long as they can hear the song. The spell ends after 1 hour, or until the weapon is sheathed, dropped, or deactivated as a bonus action.