Kamui Lightning Cutter

Kakashi forms a Lightning Cutter imbued with the Sage of the Six Path's chakra, and using his Mangekyō Sharingan, utilising the intangibility effect of Kamui on himself as he approaches, he materialises his hand and strikes his target with the Lighting Cutter directly.

The use of Kamui's intangibility enables him to attack without any vulnerability to a counter-attack on the approach while allowing him to phase through the opponent. With this attack, Kakashi was able to nearly bisect Kaguya Ōtsutsuki's right arm.