Gomorrah is one of Bayonetta's Summons before becoming her enemy
The Book of Infernal Demons
A monstrous creature hailing from the demonic wood, Johnson Forest. Taking the form of a dragon, it is incredibly fierce, identifying all that moves as game and devouring it's prey. Territorial, it is most likely to be found alone.
Gomorrah is summoned as the Climax Attack of Beloved, appearing behind the giant angel and snapping it up in its massive jaws. The demon proceeds to repeatedly bite down on the unfortunate warrior, before completely obliterating it with a final powerful chomp.
It is later summoned against Father Balder, attempting its usual attack on the Lumen Sage. Unfortunately, Balder is able to counter Gomorrah's assault by jamming its jaws with a sphere of energy. He proceeds to exit the orb and smash Gomorrah's mouth shut on it, finishing off the wounded demon by breaking its neck.
However, the demon survived as he is shown being summoned by Bayonetta in Bayonetta 2 to finish off a new enemy in a similar fashion to the first game. However, the portal fails to close and Gomorrah seizes the chance to escape and attack Bayonetta. Jeanne pushes her out of the way but in the process gets her soul knocked out of her body. She is then subsequently dragged down into Inferno as Bayonetta fights against her former demonic ally. As the long battle comes to a conclusion, Bayonetta summons a new demon and uses it to smash Gomorrah into the ground. Both demons vanish and Gomorrah's fate is unknown.