When Superman's native planet was destroyed, pieces of it became irradiated by the explosion, the result is Kryptonite. Contact with, or even proximity to Kryptonite can cause injury or death to Kryptonians.
@AtPhantom: did'nt really wanted to kill any one but i could use the Spear of Destiny using Dr. Ivo's amazing machine to turn myself into AMAZO mark 3 use Braniac's to make weapons get New God's to help out and if all else fails use a Phantom zone projector or boom tube to shoot them to the phantom zone or antimatter universe
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