Gonzui

is a supplementary Arrancar technique used to devour as many souls as possible within a large radius of the user, in order to rapidly increase the size and power of their reiryoku.

Description
To perform the technique the user must simply inhale as if they were drawing in a large quantity of air, causing the souls of beings in a large radius around them to be drawn towards and into their mouth so that they may be ingested, while resulting in the immediate death of any afflicted victims. After devouring a significant quantity of Human souls surrounding him in a single breath, Yammy Llargo remarked that the taste was horrible, to which Ulquiorra Cifer replied that it was to be expected from such weak souls.

Humans that have spiritual awareness, or mediums, can oppose the technique even if they possess only the slightest amount of reiryoku, as evidenced by the resistance displayed by the spiritually-aware Tatsuki Arisawa. However, just this one instance of Gonzui was strong enough to cause her to feel great fear and a complete loss of physical energy, followed by a loss of consciousness shortly after.