I had an idea of what happened to Urzkartaga. Chuma's dead, isn't he? He was Urzkartaga's last worshipper. According to Diana's backstory gods without worshippers fade away. So he does. But while he doesn't have any worshippers he does have one living person he has a connection to, Cheetah, so instead of his power fading into the ether in funnels down into her.