After knowing these things, Caizher can't help but feel bitter. He is someone that thinks of himself as a bit evil as he has Machiavellian tendencies. He never thought he would one day needs to be a savior of the world
Savior isn't really the right term. What Caizher will save are only the dark creatures, not the whole world. For that to happen, Caizher planned on wiping out the whole world except for the dark creatures
That was Caizher's goal to help the dark creatures but he also has another reason for doing that and that is his cultivation!
The heavens prevented any creature in the universe to ascend into Godhood because of the effect it would have. As soon as someone becomes a God in this universe, they can easily control the whole Universe
There is also a high chance that they will use the universe itself for their cultivation. For example, if Caizher won this war and he becomes a God, if he wants to advance further, he needs to use the universe
