Void Release: Phenomenon

By utilizing the surrounding wind, Kan is able to turn anything within a designated location into an illusion; everything from damage to genjutsu to even fuinjutsu, making it appear as a physical illusion. Tobirama likened this technique to the Uchiha's kinjutsu, Izanagi, able to turn reality itself into an illusion and vice versa.

Utilizing the surrounding wind as a medium, Kan can use his unique wind to void reality itself, turning real effects into illusions in an instant. It is often displayed as curtains moving out the way, taking the change with it before they disappearing, though it can take on any form of disappation. Due to its nature, no opponent can see it set up or predict its usage, as even abilities fail. By exerting its influence on the surroundings, Kan is able to literally warp reality itself, changing it as he sees fit and modifying it in his favor.

Drawback
Besides rapid chakra consumption, there seems to be no other drawback associated with the technique.

Also See

 * Izanagi