Azzy knew that there was friction between Angels and Elves due to the fact that the former took over the latter's land, which is known as the kingdom of Triastal.
But, he didn't know that his founder's first wife was the one that killed Leah's ancestor.
In an instant, everything suddenly became clear to him. Why this Celeste's name never recorded in the historical records or their clan records; why did the existence of Angels become a myth itself;, what he didn't understand is how Celeste managed to kill a person like Arthur Pendragon, who is not only a demigod but also has a celestial grade Arcana like the Excalibur.
He asked for more details, but it appeared even Devorah was clueless about it. She only said that her mother who was supposed to be in a 7-star-realm suddenly became a supreme being, strong enough to deal a blow to Emperor Arthur.