The greatest villains in Rokugan's most successful plays are always Scorpions, because it is so easy for most samurai to believe. It is the actions of students from the Bayushi Bushi School that have brought this stereotype to life and reinforced it over and over again. Every student in the Bayushi dojo is trained to be the perfect weapon of discord, capable of turning the Clans against one another with minimal effort. Weapons training is only one aspect of their education, which often includes social manipulation, stealth, and even the use of poisons when the student is deemed suitable for such things.
The Bayushi Techniques might best be described as dirty tricks. They focus on granting the character an advantage, such as an increase in Initiative, or ruthlessly exploiting any other advantage that might already exist. In particular the ability to cripple an opponent with Conditions can turn the tide of a battle against a vastly superior opponent, if one has but a little luck.