Wind Tunnel Technique

Fuudou no Jutsu (Wind Tunnel Technique)
Ninjutsu (Fuuton) [Wind]
Rank: 7 (B-Class);
Range: 25 feet/level (see text);
Area: 5-ft. tall to 25 feet/level (see text);
Duration: Concentration, plus 1 post;
Saving Throws: None;
Chakra Resistance: No;
Chakra Cost: 6.

This technique creates a space large enough to let only a Medium-sized creature or smaller creature through. The space within the tunnel eliminates all friction in the air and greatly reduces the gravity, thus increasing the velocity of objects and creature within it. Movement rate of all creature small enough to fit in the tunnel is tripled, as is the range increments of thrown or ranged weapons or objects whose path to their target is in the tunnel's space for more than half of its trajectory. The tunnel is created from the user's current location and goes in a direction at the user's choice. It can have as many turn or zig-zag as the user wishes, and only he and creatures able to See Chakra or See Through
Chakra know the exact path taken by the tunnel. The tunnel is 5 feet wide and
approximately 8 feet tall.