Yamata no Orochi is one of the only two Higher Fourteenth Stage warriors of the Tianyan Clan, and with his extraordinary bloodline, he is very likely to cross into the Fifteenth Stage of the Saint Realm Threshold in the future.
Even now, Yamata is already about to touch the edge of the Saint Realm, becoming a Semi-Saint Level existence from now on.
Just by this point alone, his significance to the Tianyan Clan and to Amaterasu the Old Ghost is self-evident.
What's more, Amaterasu has raised Yamata for tens of thousands of years. During a Civilization Era on Secular Earth, he followed Amaterasu the Old Ghost to leave Earth and enter the Starry Sky along with others of the Tianyan Clan. Now, only Amaterasu and Yamata remain.
With so many years of master-servant relationship, it's obvious how much Amaterasu values Yamata. Even though he's having issues himself now and doesn't respond to command, Amaterasu would never abandon him...
