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Byrne significantly reduced Superman's powers (though he was still one of the most powerful beings on Earth), eliminated the Fortress of Solitude and super-dog Krypto, and kept Jonathan and Martha Kent alive into Clark's adulthood to enjoy their adopted son's triumphs, as well as to provide him with support, grounding, and advice whenever he needed it.Byrne also used Marv Wolfman's idea of making Lex Luthor a wealthy business owner in addition to a scientific genius with a deadly vendetta against the superhero.<ref></ref> Byrne did away with the childhood/teenage career as Superboy; in his revamped history, Clark Kent does not put on a costume and become a super-hero until adulthood.