A month later , Samus finds out that Dark Samus ' Phazon ( like poison in our world but worse ) based attacks have corrupted her . She ( along with the rest of the bounty hunters ) is fitted with a Phazon Enhancement Device ( PED ) which allows her to use the Phazon within her . During the course of the game , Samus works to prevent the Phazon from spreading from planet to planet while being slowly corrupted by the Phazon herself .