The Second Mizukage's genjutsu which employs Yin Release.
The Yin Release (陰遁, Inton, Viz: Dark Style" or "Shadow Style) techniques, based on the spiritual energy that governs the imagination, can be used to create form out of nothingness. When combined with Yang Release, it allows the use of Yin–Yang Release.[1]
During the Nine-Tails' attack on Konoha, Minato Namikaze used the Dead Demon Consuming Seal to seal the Yin half of the fox's chakra within the Shinigami.[2] According to the Second Mizukage, genjutsu fittingly falls under the broad category of Yin Release.[3]