|Gran Rey Cero|
|Rōmaji||guran rei sero|
|English||Spanish for "Grand King Zero"
Japanese for "Royal Hollow Flash"
|User||The Espada |
Gran Rey Cero (王虚の閃光 (グラン・レイ・セロ), guran rei sero; Spanish for "Grand King Zero", Japanese for "Royal Hollow Flash"; Viz "Hollow Kings Lightning") is a variation of the Cero technique used by the Espada.
By mixing their own blood with a Cero, an Espada can fire a Cero with much greater attack power and speed, in addition to having a change of color unique to them. It is many times more powerful than a normal Cero, disturbing the fabric of space as it travels. Upon release, it spins like a razor as it compresses and decompresses due to the sheer speed and raw power. Ulquiorra Cifer states using a Gran Rey Cero is one of two things forbidden while inside Las Noches, for it is so overwhelming it could destroy the fortress.