In End Of The World, you had to fight heartless in a hoom with the Heartless making machine. This is the poem on the front (if anyone wanted it):
Ones born of the heart and darkness, devoid of hearts, ravage all worlds and bring desolation
Seize all hearts and consummate the great heart. All hearts to be one, one heart to encompass all
Realize the destiny: the realm of Kingdom Hearts, The real darkness sealed within the great heart
Progeny of darkness, come back to the eternal darkness
For the heart of light shall unseal the path
Seven hearts, one keyhole, one key to the door
The door of darkness, tied by two key
The door of darkness to seal the light
None shall pass but shadows, returning to the darkness
Ones born of the heart and darkness, hunger for every heart until the dark door opens