Phantom Sphere
Phantom Spheres are sacred, orange orbs produced and provided to Link by Ciela in Phantom Hourglass to temporarily freeze time, an ability that is imperative to defeating the final bosses, towards the end of the game. This ability is employed by drawing a figure-eight shape on the touch screen, in the namesake of the title's iconic item, the Phantom Hourglass. Link can hold multiple Phantom Spheres at a time during the battle, but cannot use more than one at a time.
Every time Link activates a Phantom Sphere, the game screen becomes devoid of color, all motion stops save for Link and Ciela, and a fast timer begins to count down from 200. In this short time window, Link must attempt to inflict as much damage as possible on Bellum's two forms with the Phantom Sword. Because Bellum incorporates flight, erratic, unpredictable movements, and only opens its eye for short periods of time, use of the Phantom Sphere is the only way to capture Bellum when it is most vulnerable: frozen, with it's eye wide open.
The Phantom Sphere is unique to Phantom Hourglass. Even though Phantoms similar to those found in Phantom Hourglass appear in its sequel, Spirit Tracks, there is no sign of Bellum, the Phantom Sphere, or any indication of its influence in the latter title.