Warning! Contains spoilers from Jujutsu Kaisen Chapter 212!The Edo Tensei Jutsu from Naruto was easily the manga's most horrifying power, but Jujutsu Kaisen's version is somehow even more terrifying. The Edo Tensei Jutsu used on a mass scale led to the fourth great ninja war, as the assembled forces of the ninja villages fought an army of powerful undead ninjas from the past. While many people have major complaints about mangaka Masashi Kishimoto's implementation of this Jutsu in the story, no one can deny the horrifying potential of it, bringing back powerful enemies who can't be killed in conventional ways and potentially forcing living ninjas to fight against their undead friends and family. However, Jujutsu Kaisen's version of this power somehow makes it even more terrifying.

https://screenrant.com/naruto-most-horrific-jutsu-jujutsu-kaisen-more-chilling/