Hovering Energy-Based Organism: Metroid
Created by the Chozo to balance the ecosistem of planet SR388 and refrain the energy based mimic parasite "X".
The creature is invulnerable to all weapons except to ice based beams and enviroment, followed by several concussive strikes, apart from that, only cataclysm explosions seemed to destroy them.
METROID SCAN SERIES
Mother Brain [link]
Final Mother Brain [link]
Zebesian Space Pirate 1 [link]
Zebesian Space Pirate 2 [link]