The Destroyer of Fódlan ( Fire Emblem Three Houses X Shin Godzilla)

This one's one of the dark story of Shin Godzilla and Fire Emblem Three houses.

Fódlan the land of the Goddess who created dragons. The goddess created the children so her legacy will continue until one of the demon servants attacks the goddess and took her blood. It was then the Demon Lord who is created from evil, darkness, and the Lust for power. It was then they created a demon monster from the divine dragon blood and the blood of the creatures and other demon powerful monsters. It was then the demon prince of destruction and later on the title of Demon King Godzilla was born. Over years his strength comes and he began to kill the Goddess's children. The goddess and her last child Serios then attack the Demon lord and Godzilla. Godzilla killed his biological mother while Serios killed his father. It was then half brother and sister fought until Serios defeat him and banish from the land of Torment. Over years Godzilla is still alive and his cells reforms to become his own self. It was then over years the Empire launch a attack in Garreg Mach giving him his time to rise up from his sleep and will attack Serios. Will Rhea as Serios kill his brother and save Fódlan or will Godzilla kill Rhea and Destroy all of Fódlan.