In the Bleach anime and manga certain characters had secret abilities that no one else knew about. So instead of posting it in the application where everyone else can see and just putting secret or something on it (which would never work) I purpose that people just pm the technique to an admin. When the technique is used in battle an admin could post somewhere in the topic either under the post or in it or whatever so no one knows untill you use it and that way people won't go running around saying they have all kinds of random super abilities. These could be like techniques could include bankai, (which the training would also have to be pmed to an admin) or a last move for an arrancar or many other things.