I guess it doesn't matter if fear exists in your mind. I can just imagine you nonexistent or in an unbreakable cage or teleport you to the event horizon of a black hole or the center of Canis Majoris. Apparently, included in my abilities is "Ability Creation." I guess that comes along with the ability to take away abilities so I could take away your fearlessness so that it's extra fun to throw you into a dizzying spiral of death and nightmares.
It's a nice ability that would be pretty nice in most situations that would allow me to carry around some sort of smoke bombs or something. The only issue with fighting against Kirsui would be that she could just create some anti-matter smoke to cancel my smoke and I would remain a bloody mess. Not only that but there's nothing I could do in the way of attacking so yeah... cool power, not going to win against Alternate Matter Materialization =P
That coupled with the previously mentioned explosion would probably make me do something like this:
The only thing necessary for the triumph of evil is that good men do nothing.