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A mushroom the Night Goblins grow that makes beer so strong it'll turn your brain to mush. They pour it down a gobbo's throat before a fight and then chain a giant ball to him. If he swings it anywhere near his friends, they're getting hit by Gork (and maybe Mork).
I drank Mad Cap Mushroom beer and now my brain is missing.
My cousin got hit by Gork because he swung the ball too hard.
That gobbo was screaming like a banshee while swinging that ball.