Escudo

The Escudo (エスクード), ( えすくーど ,esuku^do; Spanish for "Shield", Japanese for "Ten Shields") are the top-ranked Arrancar who opposes the Espada since the destruction of Aizen's Espada, they are equally powerful Hollows as the Espada, and are the main rivals of the Espada. They are lead by an unknown person.

Outline
The Escudo are regarded as an equal to the Espada, they are a group of Arrancar with a high level of power that opposes the Espada, however, they are not regarded as allies to Gotei 13. They have a different philosophy than those of Aizen's Arrancar, for they don't believe that the Aizen will the Arrancars to success, they also think that the Espada are following the wrong leader, and they also referred all Arrancars that follows Aizen as "useless marionettes that stains the name of Arrancars ". They do not also just kill anyone, they will kill if they see that person as a threat, like the Espada, they also don't have hesitation in killing their kin, the hollows and the arrancars if necessary.