Mirror Reversal

Summary
Mirror Reversal is a spell that opens a tiny portal allowing movement into the darkness of the world. The portal is created in front of the eye, and is far too small to move or pull anything out of. However, being in front of the eye, the caster can see into the darkness of the world.

The portal cannot be moved, but it can be given to others and turned off at any point.

Uses
Seeing into the darkness of the world allows the caster to see any entities that are hidden by dark magic, though it renders them blind to the rest of the world around them.

The ability can be given to others either as a way to aid them or to blind them.