Prophet Birthday Party is a silver skull in Halo 2: Anniversary, which is part of Halo: The Master Chief Collection.
It adds a guitar riff sound effect (recorded from Steve Vai) each time John-117 melees the Prophet of Regret at the end of the Halo 2 level Regret. In addition, a small lightning visual effect is added to each punch.
Prophet Birthday Party skull icon in Halo 2: Anniversary.
The skull viewed in the Halo 2: Anniversary campaign menu.
List of Skulls in the Halo series
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