Can’t remember graphic novel name?

I remember reading this a while ago as a kid, maybe a little over ten years ago. Here’s what I remember. The content was black and white. There was a scene where the boy in the novel received a ring from some mermaids that would turn into a ball of fire if the magic word was said. He later throws the ring at an evil sorceress who has the ability to regenerate her body after being wounded. The ring torches her leaving only bones behind and the girl that the boy was with tells him to separate the skull from the rest of the skeleton so that the sorceress can’t regenerate. I think there’s also a girl protagonist trying to study magic and she has a small pixie sidekick. That’s all I remember aside from the fact that I really thought it was cool and it has been bugging me For over ten years. Please help?

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