Just got off work >.>
First this technique is rare in that it requires eye contact even though it's not a sharingan genjutsu. You look your enemy dead in the eyes and as you send your chakra into him ask this simple question *dramatic pause* "Would you like to see true war?" I demonstrate the genjutsu for you as the world suddenly sinks into darkness and you are surrounded by several pairs of armored ninja battling each other. As you look around and see the hell of war of the days of the senju and uchiha and a huge black monster with red eyes appears next to you and grabs you with his giant hand squeezing your body and in reality your body is frozen. the shadow then roars "Gaze into the unending war!" and a sword shoots out of his eye and pierces into your chest. At that moment in reality I touch your chest with my finger and release the illusion. As you come to your senses I am looking at you smirking and say "That is the moment you finish your prey, with a jutsu, a weapon, your fist if you'd like but you'll be able to tell when the illusion gets to that point.
Now your turn. *makes a clone for you to attack*