The Sha are a curse on Pandaria that occured when the Titans actually killed a seven-headed Old God named Y'Sharrj. Sha are major antagonists for several dungeons and raids in Mists of Pandaria. Sha are physical manifestations of negative emotions. There are different varieties of Sha such as lesser Sha which act as regular mobs and manifest from negative emotions. There are also the Sha Primes such as the Sha of Fear, which act as bosses in dungeons and raids. These extremely powerful Sha were sealed away millenia ago but were released when they fed off the Alliance-Horde War. After the last remnant of power from the Heart of Y'Shaarj faded from existence, the Sha were destroyed, finally ending Pandaria's curse.