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What a fantastically creepy idea for a fantasy hexcrawl! There is a simply a gray hex (or several hexes) known as Stone Lake and marked with a skull. Players don't know much about the location, only ghost stories and wild tales from locals who warn that this place should be avoided at all costs. You could easily toss in the surrounding habitat as home to Medusas, basilisks, cockatrices. What is the plural of cockatrice?
Is this place cursed by dark magic? Or is it completely natural?