Kagerō

The Kagerō (陽炎) are an Eye Magic that can conjure up very realistic illusions and also reveals any weak points of the victim. It is a trait that only the Yotsuba House from Japan possess.

Characteristics
The Kagerō results in a blue film being put over the user's eyes. This film helps them see through illusions as well as a protection against Secret Art: Satan's Blue Flames. However, when used while conjuring up the blue flames, the blue film melts in with the color of the user's eyes, causing the user's eyes to permanently turn a blue shade (as seen with Fuyomi Fielder).