Ultima is killed in Antonio's dream which I think foreshadows the death of ultima in reality. Ultima is killed when Tenorio kills her night spirit. The Trementina sisters are present also who are witches in this scene
In Antonio's dream he sees Cico killing the Golden Carp. Tony finds comfort in the Carp and Cico defiles the Carp by spearing it. Antonio sees the Carp as a god and cares about it more than the Christian god.
Here we have the Golden Carp who swallows everything that is good and evil in the dream. The carp then is burned with brilliance that it became a new sun that will shine bright. This symbolises that violence is something that brought big change in Antonio and that creation is born from violence