Soulbane

This is a powerful genjutsu known to be forbidden among the Konohagakure ninja. It is a genjutsu that targets the mind and causes the target to think their friends, or themself are foes. This would cause the one(s) affected to attack who they think are a foe. It is shown to even affect those with powerful bonds, such as Naruto and Sasuke, which is why this is known as a forbidden technique.

Trivia

 * Though oddly enough, when used on Hinata and Shino, or Kiba and Akamaru, neither pair actaully turned on one another.