After being trained by the Vizards, other exiled Soul Reapers who were unwilling subjects of Aizen's experiments and developed Hollow powers, Ichigo and his friends travel into Hueco Mundo to save Orihime, and the world. Facing Aizen's army of Arrancars, who are Hollows given Soul Reaper abilities, led by an elite group known as the Èspadas which are composed of ten Arrancars with exemplary strength. These Arrancars are referred to as Espadas and are mini-bosses, in Aizen's army they serve as commanders and each has its factions of weaker Arrancars. Along with Aizen, Gin Ichimaru and Kaname Tōsen, the Èspada as a group possess comparable strength to Soul Society's Gotei 13 Soul Reaper captains. After finally reaching Orihime, Aizen reveals her kidnapping was a distraction to allow him to take Karakura Town, as its spiritual energy is what is needed for the Oken. After receiving final training from his father Isshin, another exiled Soul Reaper, Ichigo and the Soul Reapers face off against Aizen, the Soul Reapers who aligned with his cause and his most powerful Èspadas, resulting in Aizen's surrender and the loss of Ichigo's Soul Reaper powers as he uses a secret technique to seal Aizen away for good.