Kazaana

The Wind Tunnel is known to be a curse used by Naraku on Miroku's grandfather. Also, it is Miroku's most famous move. It appears to be a black hole shaped on a person's palm. Once every year the wind tunnel grows larger and the wind becoming more powerful until eventually it swallows up the unfortunate wielder. It has been shown that the wind tunnel can be damaged and expanded unnaturally.

History and Uses
Fifty years ago, Miroku's grandfather had his hand pierced by Naraku, who had disguised himself as a pretty girl. After being branded with the curse, Naraku told him it would pass throughout every male in his entire family. Soon after his son was born or in childhood, the Wind Tunnel swallowed him up. Also, when Miroku was in childhood the tunnel swallowed his father up and Miroku was stopped from coming to his aid by his father's friend Mushin, who didn't want him to suffer the same fate.

After meeting InuYasha for the first time and battling him, Miroku showed him his Wind Tunnel and after telling him his story on how he got it, Miroku helped him and his friends by using it to suck up many demons, minus poison-bearing ones like Saimyōshō and others.

In Chapter 543, Miroku's Wind Tunnel has reached it's limit and has forced him to use it sparingly. However, when Naraku has been reduced to a head, it starts to close. After Naraku finally dies, the curse is finally lifted and the Wind Tunnel disappears for good. Though in the second Inuyasha movie, it is shown that Naraku can remove the curse on his own will, as well as place it back on.

Trivia

 * According to the published book InuYasha: Zusetsutaizan Ougikaiden - InuYasha Profiles, Rumiko claimed that Miroku's Wind Tunnel can sucks up to 600kg until 700kg massive objects, she also added that if there is no obstacles during functioning, the Wind Tunnel probably would work more effective than usual. Compete with Inuyasha's Kaze no Kizu, the height of attacking enemies can up to 100 feet from the ground, whereas Kaze no Kizu only around 80 feet.