Archfey, warlock patron
A major player in Winter Court politics, sometimes called the Left Hand of the Winter Queen. While she shares her monarch’s affinity for cold and darkness, Branwyn’s domain is the alien cold and inky black of the seafloor. Sunken cities, ships, and secrets are her purview, and she’s amassed a wealth of occult and forbidden knowledge over thousands of years of history, into myth and beyond.

Curiously, she and those she chooses to deal with tend to oppose cults of the Great Old Ones. Assuming this is not a fit of pique (something Branwyn is otherwise known for), this suggests some unknown front between the Far Realms and the depths of the oceans.
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Description written by Val Ritz on discord; I sketched her because the power was out. She's meant to echo both Ursula (The Little Mermaid) and Eris (Sinbad) with some of my own preferred weirdness.

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