The Mega Core-X (sometimes referred to as Barrier Core-X or Varia Core-X) is the fifth boss Samus faces aboard the Biologic Space Laboratories research station in Metroid Fusion. The Mega Core-X is a large Core-X with miniature variants of itself surrounding it. Before the battle, it is seen downloading Galactic Federation data of the Varia Suit in a Data Room, thus turning the normal Core-X into the Varia-armored Mega Core-X in the next room. During the battle, its only strategy is attempting to ram into Samus. To defeat it, Samus must use her Charge Beam, as only fully charged shots will damage it. Firing a charged shot at the smaller Core-X orbiting the main body will destroy them, reducing both the number of obstacles protecting the Mega Core-X and the boss's attack range. The Spin Jum