Since the Kami fell to the Earth, their followers have created a mighty empire that has lasted for a thousand years. Yet the world did not start with the Fall, nor will it end if the Empire falls.
According to Shinsei, The Day of Thunder was the time in the Kharmic cycle in which the champions of Yomi must face the Champion of Jigoku, to determine whether the next thousand years will be a Thousand Years of Peace or a Thousand Years of Darkness. Jigoku sought to spread its corruption through the Mortal Realm, while the powers of the Celestial Heavens sought to leave Ningen-do free to seek its own fate.
The return of the much-changed Ki-Rin Clan to Rokugan began a time of great change and social upheaval within the Emerald Empire. For the first time since the founding of the Empire, Great Clans nearly came to true war against one another. Gaijin goods and people entered the Emerald Empire in numbers unseen since the Battle of White Stag. Some scholars wonder if these great changes are the cause of the current elemental imbalance observed by shugenja and demonstrated in the cataclysmic earthquake and tsunami of 1120.
A Tsunami that hit the Crane Coast.
The arrow loosened by Doji Hotaru takes the life of the Lion Champion.
The emperor Hantei XXXVIII dies, the Emerald Champion Akodo Toruri falls victim to an assassination attempt, and the Dragon Clan army arrives at Otosan Uchi as Hantei Daisetsu flees.
Doji Kuwanan puts together a small force with Daidoji Uji and attempts to Spirit away Hantei Sotorii from the Dragon delegation led by Mirumoto Hitomi.