Ku's Bane

Ever since the days of the Mad Emperor, Ku, legends have spoken of a great yeti that stalks the mountains of Kun Lai, its lair accessed via a tunnel network on an unreachable ridge of Mount Neverest. Scrolls within the Temple of the Jade Serpent detail Emperor Ku's encounter with the mythical beast while being escorted through a mountain valley by his detail of elite imperial guards. The Emperor claimed that the horrendous beast killed most of his men, before withdrawing into the mountains. A warning to the emperor, perhaps, that he did not rule over all of the land he had been given.
The Emperor, in defiance of the beast's warning, promised great riches and all one could desire for them, their family and every descendant of their bloodline for all time if they could slay the yeti. Many took up the Emperor's bounty. Many returned with nothing, some returned beaten and bloodied, and some did not return at all. Anywho tried to establish camps and outposts in the mountains would find them destroyed by the mighty beast before long. When the Emperor's fear of the Mogu returning drove him to madness, the yeti he had come to declare as the bane of his rule over Pandaria only fed this fear. He dreaded the possibility of the Mogu managing to capture and bend the creature to their will, to spread ruin and destruction over all of Pandaria. These fears never came to pass, and Ku's Bane remained hidden from most, watching over its territory in the mountains.
Since the days of Emperor Ku, Grummles, explorers, mountain dwellers, and even the Shado-Pan have reported seeing a great yeti that could surely only be Ku's Bane. However, over the millennia they have been few and far between. There are doubts of whether these are truly the same yeti, as for one to live so long is unheard of. There are further doubts on whether such a powerful yeti has been seen at all, and that these are just the tall tales of people high on the idea of the beast that challenged an Emperor and won.