Hello everyone! I recently started reading the manga あかやあかしやあやかしの, and one of the characters has a speaking pattern that is really confusing me.
This is a supernatural manga about a bunch of yokai living in a shrine on a hill overlooking a human town. While the leader of these yokai appears to be a young girl, she is really a very old fox spirit. I’ve noticed that she often uses more formal speaking, sometimes switching to keigo or using more formal pronouns such as お主 or 我ら. She tends to end her sentences using のう, as per the examples I’ve put below. My question is whether this particular construction is an alternative to です or if it serves some other function, especially as in some sentences it seems to replace ね. I am familiar with the (sometimes feminine) sentence-ending の; is this just some weird spelling variant?