Depending on what the webtoon author will do, but my speculation is Venersis's fate is like a curse where or prison. Where he have to partake in punishment via labor.So, Vanersis went to fight, if I'm not wrong, another/the same "black hand" demon lord that Yulian a Thrint saw, meanwhile Yulian with the "blessing" of Venersis to take the desert as his empire went like "This all are my people" and went on saving people, one is a hypocrite and the other a imbecile, but with the world ending is fine, I guess