Lightning Release: Purple Electricity

The user unleashes a stream of purple electricity from their hand to attack targets from a short-to-mid range. This technique was powerful enough to summon rain clouds when shot into the sky. Kakashi can also creatively allow this technique to flow through spilled alcohol.

In the anime, Purple Lightning has shown to have a number of applications. It can be used like Chidori and Lightning Cutter, concentrating lightning in his hand and attacking quickly with it, apparently without the tunnel vision drawback of the latter two techniques. Not only that, he can even replicate Sasuke Uchiha's Chidori Current with it, sending bolts of purple lightning all around his body in a omni-directional attack.

Trivia

 * The term "shiden" is part of the idiom, which refers to a sword flash or a quick brandishing of a sword akin to lightning.
 * This technique was designed by Kakashi some time after the loss of his Sharingan from the Fourth Shinobi World War; which left him unable to properly use his signature Lightning Cutter technique without danger.
 * In the anime, Boruto used this technique through the Kote.