Powamps are green, medium sized, non-aggressive creature that tend to dwell in aquatic areas. If it perceives a threat, it will inflate for protection. In Super Metroid, Powamps live in the underwater areas of Maridia. Samus can use them as grapple points for the Grapple Beam. For this reason, it is unwise to kill them. Powamps drastically change in Metroid Fusion. The X mimics of the Powamp now have spikes on their sacs, and they are mostly indestructible. they are mainly used to block Morph Ball tunnels before getting the Diffusion Missiles, which allow them to be frozen so they cannot block the path.