The Kazaana (風穴, "Wind Tunnel") was a curse placed on Miroku's grandfather by Naraku; it would go on to become Miroku's most famous technique. It appeared to be a black hole shaped on a person's palm. Once every year the wind tunnel grew larger and the wind became more powerful until eventually it swallowed up the unfortunate wielder. It has been shown that the wind tunnel can be damaged and expanded unnaturally.