The God's have a month prep.
The fight takes place in Asgard, the Kryptonians were lured there. The God's have decided that they have rule and these "aliens" are a threat.
This takes place in two rounds.
Round 1) Lex Luthor is secretly behind this and he has influenced the gods yada yada yada... Captain Marvel, Wonder Woman have kryptonite rings. This fight is to the death. No BFR. Morals off. Super family has had enough. Superman knows if he wants to end this it has to happen here in Asgard.
Round 2) Regular battle in Asgard. No BFR. They also have