How World of Warcraft players solved a wild puzzle to unlock Legions rarest world boss

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Not that I ever played for very long, but I'm in the "it's been so long" camp of WoW players. This interesting article talks about some very hidden caves and at least one boss that are quite intriguing though... http://www.polygon.com/2016/9/7/12837266/world-of-warcraft-legion-kosumoth-boss-spawn-secret-puzzle

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