When Seg-El and Nyssa-Vex were to be bound, they headed to the Genesis Chamber where they had the Oracle determine their future child. Cor-Vex was said to best be suited for the Lawmakers Guild, living for 173 cycles.
During the season one finale, his mother evacuate him from the Genesis Chamber and transport him into a Medusoid to save him from being part of the imminent collection of Brainiac. On her way out, Nyssa encounters Jax-Ur who reveals to her that she is a clone conceived via the Vara Protocol.
Cor-Vex was said to be of good character.