Lucifer first thought of doing nothing and let his god do the thing but later he thought that why should anyone suffer just because of the sins of god. He thought of helping the humanity and defeating the dragon king but he knew it very well that this was something that he couldn’t do alone. So he planned on giving the entire information to Amanadeal his elder brother. After hearing all this Amanadeal planned on involving their rest of the siblings as God is sealed in the silver city but angels could come in and out of the silver city. So Amanadeal without letting his dad know he called every sibling but they only had a power of four Lucifer, Amandeal, Rameal and Azrael as Yuriel was dead....