High Heavenly Plains

This is Ashina Uchiha's strongest Genjutsu, it is noted to be the genjutsu that kills. Inside the genjutsu world, the targets are surrounded from all sides by four toad samurai, with their mind and body completely sealed between their hands in an illusionary cube of water. The four unmoving toads won't lift the complete binding until the user gives the order.

Itachi noted that not even the tsukuyomi matches up with it.