How to defeat Mytha, The Baneful Queen.
You have to go to the bonfire and light your torch. Turn around and set the windmill on fire. This will make sure the poison in the room lowers allowing you to fight her without being poisoned.
She is weakest against fire and dark spells. I used sorceries because I didn't know any better at the time.
This was done in New Game+ and this is how you get the covetus silver serpent ring +2.
![](https://s2.save4k.ru/pic/ds2OpZK_tbk/maxresdefault.jpg)