Mantis Invasion

Power Hungry
In 1132 in an effort to expand his power, Yoritomo seizes control of the lands of the Phoenix Clan claiming they were too weak t hold them themselves. Yoritomo hoped to take them quickly, but the Phoenix Clan Champion Shiba Tsukune sees this as an act of war and responds in kind. As the Phoenix were nowhere near combat ready Yoritomo slowly makes his way deeper into phoenix lands. (3E p. 22)

The Lying Darkness
It was later concluded that Yoritomo's actions were based on advice given by shape-shifting minions of the Lying Darkness. (3E p. 22)