The hydro beam is one of samus' beams in Metroid evolution. It turns the markings on samus' arm cannon blue when selected. It is a beam that can run out of energy so samus has to defeat enemies to regain water for it. The hydro beam is effective against fire based enemies, flame samus and fusion Ridley when it's blue. It is a continuous fire beam, and so doesn't have a charge shot.

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