The Story

Post Siege of Orgrimmar
After the events of the Siege of Orgrimmar and the termination of Garrosh's campaign over Pandaria, the august celestials decided to appoint new guardians to watch over pandaria, they assembled four of the mightiest champions of pandaria who mastered various fighting skills and made them the four masters of four fighting academies within the celestial's temples to train new generations of warriors and fighters who would soon after safeguard pandaria from any imminent peril. They also entrusted them with four sacred scrolls each possessing a fraction of the celestials' power, Pandaria has lived in peace ever since.

Howard the Malicious
Howard was a human who sought power ever since he escaped from his home in Westfall, he eventually joined the Twilight's Hammer and was forced to endure a devastating defeat after the heroes of Azeroth defeated Deathwing; causing most of the cultists to desert. Howard fled to Pandaria seeking refuge and shelter now that he was hated from his people, he found the pandaren welcoming him into their land and granted him safety, Howard went to train with the monks who welcomed him warmly in their ranks unaware of his past; he quickly rose within ranks until he became a grand disciple.

Howard's treason and theft of the first scroll
Soon after Howard learned of the four sacred scrolls, he was eager to obtain that power for himself alone, indeed the strength of the celestials could be his for the taking, he deserted from the Jade Serpent Academy where he belonged to and then raided the Black Ox Academy with a group of his followers; he eventually slew Master Xu Feng and claimed the Scroll of the Black Ox granting him hold of one of the four sacred scrolls. Ever since then a new peril has risen in Pandaria as Howard tries desperately to claim the three remaining scrolls and be gifted with the power of the celestials.