 Additionally, Ulquiorra is unique among the Espadas in that he has a second release, .He becomes demonic and black-furred with clawed hands and feet, his sclera turn green, grows a long thin prehensile tail, and gains markings similar to blood flowing freely from his hollow hole.Ulquiorra's second release is said to be secret to everybody, even from Aizen thus making him the strongest Espada.