 Espadas ranked 4 to 0 are forbidden from using "Resurrección" within the confines of "Las Noches" due to their immense destructive potential, which could be enough to destroy the fortress.Espadas may be demoted when they are maimed, replaced by a more powerful arrancar, or have violated Aizen's orders.The Espadas are also allowed to personally choose any two-digit arrancar as their direct subordinate, referred to as their .