Prophet Birthday Party

Prophet Birthday Party is a silver skull in Halo 2: Anniversary, which is part of Halo: The Master Chief Collection.

Effect
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.

Trivia

 * It is most likely named for the Grunt Birthday Party skull, which has another comical effect.