"So, since I've explained Aetheria to you, I can now go on with my explanations about candidates."
"Once upon a time there was a common enemy of all Aetherian beings, that was Voidrender. The Eater of the End. Father of monsters. He was the origin of all monsters, and any monster you see now is descended from him."
"He had one terrible power that made him a nearly invincible foe: Instant infinite Regeneration. With this, he couldn't be killed or greatly harmed."
When they asked why he was the enemy of all Aetherians, Thalso told them bluntly that Voidrender was a world eater. He devoured worlds for food, and apparently, he was the size of all Aetheria's worlds combined, but he enjoyed moving around in the form of a human male, killing all the beings with his own hands before eating their world.
"How do they fight something like that?" Taria asked in a horrified whisper.
They shuddered at each explanation from Thalso.