I Survived in Anbu to Become Super Kage

Demonic Illusion: Nirvana Sanctuary Technique—a mass hypnosis genjutsu.

Those caught in the technique would see falling feathers. Drawn to the sight, their eyelids would grow heavy, and they would fall into a deep sleep.

Yako activated his Sharingan and began to learn this ninjutsu.

Without the Sharingan, the technique required dispersing chakra into the surrounding air, using it as the medium for the genjutsu.

With the Sharingan activated, he only needed to make eye contact to cast the illusion.

Delivering chakra through eye contact with the Sharingan was far more efficient and produced a stronger effect.

Learning the genjutsu went surprisingly smoothly. Yako grasped the basics in just half an hour.

Without a test subject, however, he couldn't be sure of its effectiveness.

Three or four hours later, Purple Cat found him.