Touma is an inccubus !!!!
About the Touma Right Hand:
-In accord to Index is not a magic power.
-In accord to Hyouka is not an esper power.
-In accord to Misha/Gabriel's reaction, it can affect angels.
-In accord to Tsuchimikado observation it destroys the illusions of this world.
-In accord to Aleister his level of danger is at Defcon3.
-In accord to Terra this power existed before with a different name.
-Is something very very important(and dangerous) to the magic world ruled by the Christianism.
-And finally, less than 5 persons in the world knows about this "power".