Phazon

Phazon is a highly radioactive mutagen in the Metroid series of games. It is produced by the planet Phazee. It has been featured in all three games of the Prime series: Prime, Echoes, and Corruption.

The first time Phazon was encountered was on Tallon IV, the planet on which the game Metroid Prime takes place. Chozo lore states that Phazon came in a meteorite with the "Unholy Worm" (in reality a creature known as Metroid Prime). Later, in Metroid Prime 2: Echoes, another Phazon meteor strikes the planet Aether, causing a distortion in the fabric of space and creating an alternate dimension mirror planet known as Dark Aether. In Metroid Prime 3: Corruption, Phazon Meteors strike multiple planets throughout the game, and are referred to as "Phazon Seeds" or "Leviathans". Samus embarks on a quest to destroy these seeds before entire planets become corrupted beyond salvage.

Two kinds of Phazon have been seen in the games:

-Blue Phazon is the most common, seen throughout all three Prime games. In Metroid Prime, an upgrade to the Varia Suit known as the Phazon Suit granted immunity to Blue Phazon, which would normally damage Samus if she touched it. It is also utilized in the final boss battle of Metroid Prime, where Samus uses pools of pure blue Phazon to create the devastating Phazon Beam. Space Pirate experiments showed that a larval Metroid, when exposed to Blue Phazon, would mutate into the oddly red-tinted Hunter Metroid.

-Orange/Red Phazon is much rarer. It is only found in the final area of Metroid Prime, and is not seen in the sequels, Metroid Prime 2: Echoes and Metroid Prime 3: Corruption. The Phazon suit provides no protection against Orange Phazon, as according to ingame logs, it is roughly 89% more potent then the common blue variety. A larval Metroid exposed to Orange Phazon mutates into the Fission Metroid, displaying the ability to divide when killed without other exposure.

Chemical Reactions
It is partly chemical in nature, featuring the ability to react with an unknown chemical to produce "phazite", a nearly indestructable armor, which can only be penetrated by phazon energy orbs or X-ray rich plasma.