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Cero is an attack used by the creatures and beings known as Hollows and Espada. It is seen as a blinding flash of red light and is extremely deadly.
Cero (虚閃 (セロ), sero; Spanish for "Zero", Japanese for "Hollow Flash", 'Doom Blast' in the Viz translation, "Empty Disaster" if the kanji is literally translated) is a form of attack used by Menos, Arrancar and Vizard. Basically an energy blast, it consists of firing a blast of concentrated spirit energy at the target. While in most cases it is fired from the mouth, some Arrancar and Vizard are capable of firing Cero from their hands, fingers and other parts of their bodies. This often requires the user to under take a specific pose, with Coyote Starrk being the only exception.
The power, force, speed, and blast area of the Cero is dependent on the strength of the user (i.e., the stronger the user, the stronger the attack), and there are some Arrancar and Vizard who have come up with their own variation.