Surudoime

Surudoime (するどいめ, Keen Eye) is noted to be one of the most powerful genjutsu in existence, if not the most powerful. It is unique to the Kurama Clan, and only available to those members who have inherited their clan's Kekkei Genkai to it's maximum potential, such as Tatsuki Kurama, and as such, is extremely rare, and only wielded by one specific individual in the span of several generations.

Overview
When utilized in conjunction with Ranmaru's Kekkei Genkai, the technique is virtually unavoidable, as the dojutsu provides the wielder with the ability to cast unavoidable genjutsu. Rewarded and appearing only in those select few members of the Kurama Clan who have inherited the clan's kekkei genkai to it's maximum potential, which allows the user to cast unbelievably powerful genjutsu capable of killing it's target, the technique is further amplified in power, to the point where it's sheer genius rivals even the Infinite Tsukuyomi.