Diffusion Missiles were a special type of chargeable Missile made by the Galactic Federation. They augment the Ice Missiles. Their only appearance is in Metroid Fusion. It is the fifteenth item collected in that game. Diffusion Missiles have a very large blast radius, but only when charged. When charged and fired, the Diffusion Missile creates a shockwave of ice energy that spans the entire screen, freezing enemies, as well as destroying Missile Blocks. This is only necessary once, but is useful in other situations.