Boost Guardian

The Boost Guardian was a mutated form of Warrior Ing that had absorbed Samus' Boost Ball in Metroid Prime 2: Echoes. The Boost Guardian was found in Dark Torvus Arena.

In the Boost Guardian battle, Samus must keep watch for her health, for no Light Crystals are present, so she must rely on Inglets for energy. Samus can hurt the Boost Guardian in its solid or liquid form, but not in its Morph Ball form. To get it out of liquid and Morph Ball, she must drop bombs. If Samus has just turned it back from liquid to solid, a mini-movie will appear and Samus will automatically be facing the Boost Guardian. Although it is a tough battle, it allows Samus to get a Dark Temple Key that is up on the turnpike in the previous room.