Kryptonite
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Real Identity: Kryptonite
Affiliation(s): Krypton
Capacity: Radioactivity and Photosynthetic Interference
Kryptonite are meteorites that were once made up the planet Krypton. After the planet's unstable core could no longer handle a growing radiation, it exploded. Several shards of the planet were caught in the acceleration one lifeboat that escaped to Earth. It was studied and concluded to be a transuranic element with an atomic number of 126. Decades later, it is discovered this element can be used against Superman. Superman's Kryptonian physiology absorbs yellow sun electromagnetic radiation and gifts him with the range of super powers. The kryptonite emits it's own radioactivity that interferes with Superman's solar absorption and painfully forces the energy out of him. As a result, kryptonite causes extreme pain, loss of powers and even death with prolonged exposure. Lex Luthor spent billions mining kryptonite in order to gain an edge against Superman but was always defeated. Since then, Luthor incorporated kryptonite into his technology.