Gomorrah is an enemy of Superman.
Along with her husband Sodom they both made their first appearance shortly after Superman’s injuries brought about by Gog.
When she touches hands with Sodom, they have the power to send out blasts that turn whatever they hit into salt. It is unknown how they both got their powers and they seem to just want to defeat Superman for the sheer glory of it.
However at the end of their battle with Superman he realizes how their powers work and splits them up. As he gets ready to deliver the final blow to Sodom, Gomorrah, realizing that the situation looks futile abandons her husband and flees.
She has not made an appearance since.