Seven Forbidden Powers

The Seven Hidden Powers, or known as Nanashiki is an ability that comes in seven different forms.

Overview
According to Brandon Redroot, those who mastered the Nanashiki will have the strength of a thousand men. The overall strength of a Nanashiki user is measured by Level, but the Level is only found out by using an Indicator Bracelet. The higher the level, the stronger each technique's potency becomes. Most of the users have their own variation of each technique, to increase their versatility and originality. Also, certain users tend to be more specialized in one technique.

Nanashiki is the main style of combat for one of World Rebirth's assassin groups, known as the Dark Phoenixes. But some of World Rebirth's soldiers have also demonstrates it's use, too.

Outside of World Rebirth, there are also others who learned the Nanashiki techniques, or adapt their principles to create their own, similar techniques.