Lucifer did not know the full story as his father had placed a law that barred people from talking about it, especially to him. The only reason he knew about it was that he used to hide and eavesdrop on the servants' conversations, and his friends would also tell him things that they learned from their parents.
But he could never confirm this kind of information with his father. After the unfortunate passing of his father, Lucifer tried to ask some of the elders in the council, but no one dared to say anything to him, even after he threatened to kill their entire clans.
In the end, he was stuck with only the basics, such as how he used to have a twin brother who was killed not long after they were born.
Apparently, on that day, an aloof grey-haired warlock raised an army of dragons and attacked Alercane, kidnapped the Daemon Queen Cahryss, and seriously wounded Daemon King Ralmanoz before disappearing from the face of The Nightmare Rift.