Vermilion Bird Autumn Breeze

A sensing technique unique to Shintai that allows him to manipulate the ambient air and wind flow in his vicinity and later on, freely manipulate wind created and imbued with his own chakra. Originally used by him to keep a track of anyone entering Reikaigakure without being detected.

Shintai would originally emit chakra that would be absorbed and infused with the gentle breeze that is constantly blowing in Reikaigakure and thus by combining it with atmospheric air and gases, carried by wind, he would be able to survey identify the chakra volume and signature of people along with their physical mass. Due to being tied closely to his physical senses and chakra perception, any contact with the chakra-imbued wind would give away one's position in spite of them suppressing their chakra or masking their physicality. As stated by Shintai, the only way for one to avoid being sensed by this technique is if they are able to successfully suppress/alter the volume of their chakra, disguise their chakra signature and use prosthetic and costumes to appear as someone familiar. This technique can also be used as a medium for the sinister wind technique.

Later on, Shintai was able to simultaneously expel and convert his chakra into wind and combine it with ambient wind to increase the efficiency and range of his technique by at least twenty fold. Despite being a mass area technique, he is able to tell where an intruder or a camouflaged enemy is with pinpoint accuracy.

Trivia

 * The Vermilion Bird is one of the Four Symbols of the Chinese constellations. While commonly associated with fire and summer, given its wings and ability to fly maybe the reason for its association with wind in this case.