Liquid Phazon is a semisentient, Phazon based creature. They are the adult form of Phazon Grubs, which they are capable of spawning. Liquid Phazon takes the form of a puddle of Phazon capable of movement. Defensively they secrete a highly toxic substance to protect themselves from predators, they are also capable of limited shape-shifting in order to dodge enemy attacks.
- "Liquid Phazon appears to be a semisentient glob of Phazon. Their young are known as Phazon Grubs, and eventually metamorph into their adult, or "puddle" form. They exude a toxic chemical to protect themselves from predators. Contact with the substance can be deadly. They can alter their shape in a limited fashion, usually to avoid incoming attacks." — Logbook "Liquid Phazon" (Metroid Prime 3: Corruption)
- "Spawns Phazon Grubs. Consumes Phazon in any form." —Scan data (Metroid Prime 3: Corruption)