Yotsu Bushi
The original Yotsu technique was based on the family's self-appointed role as protectors of the common people in Otosan Uchi. The later evolution of a full-scale bushi School happened as a result of the family's experiences fighting the Spider Clan in the ruins of Otosan Uchi. The Yotsu were forced to fight with stealth and ruthless aggression in an environment where the dominant terrain feature was ruined buildings. Although the resulting school was not one which more rigidly honorable samurai would admire, it suited the Yotsu well and they have maintained its techniques ever since.