It is a genjutsu which affects the target through physical sensations shared between them and the user, instead of affecting the chakra steams of the opponent to perform the illusion.[3] Like its counterpart, in exchange for the temporary ability that it grants the user, the Sharingan with which Izanami is cast is rendered blind and loses its light forever. According to Itachi, this technique and Izanagi form a pair, but unlike the latter, which is a technique capable of altering destiny,

Izanami is instead one that "decides" it.[4]
Izanami 3