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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-X battle theme in Metroid Fusion.
This theme received a remix that plays during the Diggernaut battle in Metroid: Samus Returns, named Boss Manic Miner Bot in the internal files and Boss Battle 6 in the Sound Test. A slightly different, shorter version plays during the Diggernaut chase sequence in Area 4, appropriately named Boss Manic Miner Chase in the internal files. Ironically, although it also appears in the game, the Arachnus received an entirely new theme.
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.
The theme from Fusion can be heard here: [1], the theme from Corruption here: [2], and the battle theme from Samus Returns can be heard here: [3].