Red Devils

Herrera's Army was a military force that was founded by Herrera Tresckohen as an underground resistance movement to the rule of Sōsuke Aizen. Its members consisted of arrancar who grew disillusioned with being led by shinigami rather than hollows. After its discovery, the movement was scattered and its members, consisting of only Herrera as Quinta Espada and various numerós, were forced into exile. Herrera revived his army, bolstering his forces after Aizen's defeat and taking over Las Noches, crowning himself the King of Las Noches.