Infinite darkness

The user puts the target in a genjutsu where they are left in perpetual darkness. This makes it impossible for even advanced dojutsu to see clearly. Rank: A. Style: Genjutsu. Chakra cost: 60 per turn. Range: 100ft cube, +20ft each round. Save: 16, int vs blindness. Damage: None. Focus: Yes. Requirements: None. Enhancement: Doubled radius. Minor Action