Breathless Asphyxiation Sphere (Earth-1529)

The Breathless Asphyxiation Sphere is a forbidden airbending technique.

Description
A rather sinister technique, a user manipulates the flow of air within the respiratory system of their victim, extracting it all from the victim's lungs through the nostrils and mouth, preventing any new intake of breath from forming through an air sphere around the head, eventually killing the victim by suffocation - which has gained the technique its forbidden status.

It was used by Zaheer to assassinate Earth Lady Hou-Ting, and was later attempted to be used by him against Naruto Uzumaki,  but the technique was interrupted before.