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Berserker Lord is the name of the theme that plays during both fights with the boss of the same name in Metroid Prime 3: Corruption. It is a remix of VS Mulcalah, the Arachnus battle theme in Metroid Fusion. It should be noted that the Berserker Lord resembles the Arachnus, as well.
In Metroid Prime Trilogy, the theme has been added to the Soundtrack Gallery along with the Aurora Unit 313 theme. Both themes have replaced the Bryyo Thorn Jungle and Metroid Battle Themes that were originally available.