Here's one of the descriptions,it's from our RP:
Kotoamatsukami is the ultimate genjutsu granted by Shisui Uchiha's Mangekyō Sharingan. The technique itself allows the user to enter the opponent's mind and manipulate them by giving them false experiences, making it seem as if they were doing things of their own free will. It is regarded as a genjutsu of the highest class, due to the victim being entirely unaware that they are being manipulated. Danzō gained access to this dōjutsu by taking and later implanting Shisui's Sharingan into his own right eye-socket while Shisui was still alive. The technique will imprint an absolute "order" inside the enemies mind, manipulating his thoughts, memories and even his feelings to make him behave or decided something. This type of mind control technique is so perfect that only sensors or Byakugan users will know of it, not for deciphering it, but by noticing their chakra (or that of the one affected by it) flow altered. The control is absolute and can break even the binding done to a revived Edo Tensei summon. However, the user can't control the targets actions to a great detail. He can only imprint a set of simple but absolute "core truths" that the enemy will take as his own "truth" and react upon it.