El Palacio (spanish, lit, The Palace) is a long, cylinder-shaped castle with a door on top and a large base. It is the base of operations for The Arrancar Five. On each level (from top to bottom) intruders are confronted by progressively stronger opponents, the first being Gyoumaru, the second Kakugyō, and the last Rascar. Akujin lives at the very top. It is located in Hueco Mundo.