Oko - Howlback Reference 1

A monster worse than anything they’d seen before raced down the jet-black span toward her. It was a dark blue, almost black, creature with four clawed arms and four taloned legs, a spine ridged with writhing tentacles, and an eye-less head whose hideous round maw was lined with perfect white sharp teeth. A four-armed, tentacled howl-back, just as Elowen had warned.

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Throne of Eldraine: The Wildered Quest, Part Two: Winter