Giant Hollow Fortress

The Giant Hollow Fortress is a floating structure commanded by the Unnamed Female Arrancar during an attempt to attack Karakura Town. Its core is the most powerful part, as well as the most fragile.

Overview
This Fortress is made up of hundreds of Hollows, merged together, thus creating a giant Hollow-like building. Kon destroys a large Hollow called Zonzain with his riserbeam. When other Hollow arrive so does the karakuraizer-team.Together with his team he destroys every hollow but then they spot a large fortress flying in the air. After the destruction of the Hollows fortress, Kon soon falls asleep as Urahara's plans are completed for the final showdown in Karakura Town. The fortress is later destroyed by Urahara Kisuke's Benihime, after the Karakura-Raizer Team prevent it from destroying Karakura Town, leaving the full extent of its powers unknown. The Unnamed Female Arrancar perished within the Fortress.