The Destroyer is the final boss from Romancing SaGa 3. It is the embodiment of the Abyss's power, born when the two destined children, Sarah and Shonen, enter the Abyss at the same time. Sarah warns the heroes that such power would destroy the world, including the Abyss, so the heroes argue that if this power was so great, it could restore the world as well. The heroes tell the the two to combine their strength to convert the Destroyer into a power of creation, while they fought it.
As the Destroyer is defeated, it's power engulfs the world (and possibly the entire universe) and completely annihilates it. However, since it's power was turned into a power of creation, the world is recreated shortly after, without the presence of the Death Eclipse or the Abyss, allowing everyone to finally live in peace.