 He tried to take over the world and destroyed Krypton's moon, Koron, using a nuclear-like weapon called a "Nova javelin" which involved alien technology.In this version Jax-Ur is not sent to the Phantom Zone, not discovered for many years to come, but he is defeated by a coalition called "The Seven Armies," led by Sor-El, ancestor to Jor-El.He is finally assassinated by a former minion, but his actions had dictated Krypton's policy towards alien or innovative science since, a factor in the events in the novel.