Kryptonite is an element created from the substance of the planet Krypton after its destruction. A radioactive element, it weakens and eventually kills Kryptonians. It can also cause mutations in normal humans, giving them super-powers that often reflect their personalities or desires.
Red Kryptonite also exists, which can negatively affect Kryptonians' minds.
If any Kryptonian is scratched by this Kryptonite, and it enters the bloodstream, it immediately causes powerful delusions, same as schizophrenia in a human being. It can drive the mind insane, to believe false accusations, leading them to hurt themselves physically and tire them out.
This article needs to be updated. You can help Multiversal Omnipedia by adding to it.