First, I use my water chakra to create a thick mist surrounding the area with the Hidden Mist jutsu. Then I take out a kunai and approach the opponent silently, each of my movements barely making any noise. Once I have reached my opponent, I hold the kunai up to their neck and slash their throat, killing them.
Battle use: You would use it to land a sneak attack on the opponent
Technique I would pair it with: I would use a strong weapon to do this jutsu so that it will cause more damage and increase the chance of the opponent being killed. I could also use a jutsu to flow elemental chakra through my weapon (such as (Chō Biburāto Raitontō) - Super Vibrating Lightning Release Sword) to make it more deadly and powerful.