Clueby

What why? What made you think that? Rhea didn't create the crest system it is the nobles themselves who imposed it. Yes she calls them blessings of the Goddess but it's not like she thinks someone with a crest is superior. In fact the crest in most noble families were created by the murderers of her race. If anything, she should hate them. She may have abused her power to manipulate history and do vessel shenanigans. But ultimately her goal isn't power and she isn't hungry for it.