Eurus

Eurus (ウーラス Ūrasu) is an offensive spell that can be used by the various magics that utilize the element of air.

Description
A powerful, and assuredly lethal, spell, Eurus can only be utilized with someone whose skill in air based magic is masterful. With enough control and mastery over their magic, an Mage can forcibly apply their influence over the air in a person's respiratory system, extracting it, and surrounding the target's head in a vacuum, preventing any additional air from entering the lungs. Through this method, the target is effectively suffocated.

While a very powerful spell, due to the fact that is it a surefire kill when used on any target that actually needs to breathe, it's use isn't widespread due to the fact that the victim's death is usually prolonged and cruel — essentially, any individual with a conscience cannot usually bring themselves to use this technique.

Trivia

 * This technique is based on the suffocation techniquye shown by Zaheer in Book 3 of The Legend of Korra.
 * Eurus is the Greek God of the unlucky east wind, said to bring warmth and rain.
 * Unable to decide what magic to create this spell for, Darkrai made it open to any air-based magic out of fairness.