Being able to use my opponents fears against them. Why dodge all the danmaku when you can just give traumas to your opponents so they mentally aren't able to fight anymore? Being able to know, expose, and manipulate someone's nightmares can give quite a lot of game, even more when it's more that a 1v1.
Playing with the feelings of the people seems like a jerk move on a battle, but if it's to death, might as well not lose.
An example would be something like making someone relive the memories of a relative one dying, and changing some of those to make them feel like the culprit, or to just leave them traumatized.