Demon Tower

The Demon Tower is a boss in Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-, and Kingdom Hearts 3. It is a mass of Shadows in a twister formation that attacks Aqua throughout her journey through the Realm of Darkness.

Strategy
The Demon Tower is encountered thrice in the game: the first in Castle Town, the second in the Depths of Darkness, and the third in a boss rush in the World Within. Despite the differences in health throughout the fights, all three fights play similarly. It only has a couple of attacks, indicated by the Shadows' eyes glowing red: one in which the Tower rams Aqua, which can be defended by Barrier, and another in which the Tower divides into the Shadows. When the Tower is separated, the Shadows can be attacked and destroyed. Shotlocks, Situation Commands, and magic can help subdue the Tower quite quickly.