After Satan lost his entire family, he began to destroy one country after another through his power. Of course, he didn't kill them all but let one country live on to hate the Titans.
Continents have been destroyed, and humans fuelled by hatred and the need for a place to survive finally try to seize land from the Titans.
Previously Lancelot and Freya wanted to stop the Satan, but the power of the Satan was something beyond reason; in the end, they went to the Titan continent to join forces and control what the humans were doing.
The angry Titans began to think about wiping out all humans, but the gods and goddesses did not want that; for them, if humans died, then it would disrupt the cycle of death, and in the end, they came down to help humans.
When the Titans had difficulties, Lancelot was appointed leader of the so-called Titan Gods, but at the same time, after Freya gave birth to Vivian, he was taken back to the goddess realm and locked up there.