Jax-Ur was a member of the Science Guild. She worked with Val-El and Daron-Vex and was a very good to friends to them. But she left the guild when Daron sentenced Val to death and took away his family's ranks. After leaving the Science Guild, Jax formed a rebel group named Black Zero that aimed to unite the citizens of Kandor City and stop the oppression of the Rankless.
Later, Daron-Vex was brought to her. She explained to him why she left the Science Guild and formed Black Zero.
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