Storm Riders

Orochi
When exactly the Storm Riders of Tempest Island have started "collaborating" with the orochi may or may not exactly be known, but Yoritomo Kaigen had exposed Yoritomo Kumiko to their works after she became the Mantis Clan Champion.

The Orochi come from the Realm of Tricksters and they absolutely despise their home and want to leave their home very strongly. The orochi are the targets of the mujina and other spirits of the realm and it's bad for them because the orochi have no sense of humor whatsoever. The storm riders discovered a way to help them cross over into Ningen-do (the mortal realm). The storm riders formed a pact with the orochi in that they would help bring them over and in exchange they would aid them in efforts and plans that they have (which to this point have not fully been exposed, but it can be assumed that they are to aid them in their war against the pheonix, whether true or not).