Is she drawing energy from out of the air or something?...

It's like, I recall hearing about Master eating the mist.

Something like that couldn't be delicious in the least -nodesu...

But Master learned how to do that because it was part of her training, you know?

Doesn't it seem like Kuro's kind of like that?...

Then this would be a characteristic of her species -nodesu.

Then isn't she already among the likes of divine beasts and youkai -nodesu?

That assumption is premature, Assistant nanodesu. ... Ah, yes...

Have you guys ever seen Yatagarasu fight?

Yes, several times.