Cero Oscuras

is a variation of the Cero technique used by Ulquiorra Cifer in his Resurrección and Resurrección: Segunda Etapa, Murciélago.

Description
Cero Oscuras (黒虚閃, セロ・オスキュラス, sero osukyurasu; Japanese for "black hollow flash", Spanish for "Dark Zero") is a black Cero, used only by an Arrancar in their released form. This cero compares to Ichigo's black Getsuga Tenshō. It covers any exposed light into pitch darkness. It is too early to tell for sure if Gran Rey Cero is stronger or not, because only Gran Rey Cero coupled with any Espada above Cuatro releasing their power are forbidden under Las Noches. Obviously Cero Oscuras should be forbidden as well, since an Espada ranked below 4th should be able to use Cero Oscuras after his/her ressureccion under Las Noches. The Cero Oscuras' range is vast, and its attack power is unknown. The Cero Oscuras is far greater than a average Cero.