Cero

Cero
Cero, or "Hollow bullet," is a form of attack used by high-power hollows. It consists of firing a blast of concentrated energy at the target, stealing the target's soul and returning the power from the cero and the soul to the user.

Appearance
Most cero are red. Ichigo's hollow form's Super-Cero is tri-focused and pink. Ulquiorra Schiffer's is green.