The Arrancar arc in Bleach focuses on the conflict between the Soul Reapers and the Arrancar, a group of Hollows led by former Soul Reaper Captain Sōsuke Aizen, in the realm of Hueco Mundo. This arc introduces the Espada, the ten most powerful Arrancar, and features battles between them and the Soul Reapers. The Arrancar arc is generally considered a key point in the story, as it involves significant character development and introduces new powers and abilities.
