What is the definition of Rhiannon?

Rhaiannon is a name that's as mysterious as a witch's potion and as beautiful as a peacock's tail, but with a dash of unhinged elegance. It's the name of the enigmatic singer from the 90s, but let's be real, we've all heard her name in a song or two, and let's not forget that she had a penchant for dramatic flair that could make your favorite horror movie jealous.

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Now, here's an edgy sentence using the name: "In the heart of the dark forest, a rhaiannon with a voice as haunting as a vampire's laugh, stalked the shadows, promising a tale so unsettling, you might want to double your whiskers and double your fear."