Overclock (Lightning Returns)

a gameplay concept from a game Lightspeed is a gameplay concept in Lightning Returns: Final Fantasy XIII. It is said that Lightning can use Lightspeed to slow down time, or even freeze it, around her while she moves at normal speed. The usage of Lightspeed reduces the thirteen day limit that Lightning has to save the world. Lightspeed is activated through the new system of points, Energy Points (EP). EP is gained by defeating enemies and is represented as a percental value. More than 1 EP point can be stacked.

Etymology
The Speed of light or Lightspeed is a physical constant, the rate at which light travels in a vacuum.

Trivia

 * When making the announcement trailer of Final Fantasy XIII, a concept similar to the Lightspeed system was used in the battle system demo. In fact, no battle system had yet been designed for Final Fantasy XIII at this point, and the trailer was merely a visual demo for the feel of the game the developers wanted to portray. It appears, however, that the demo was the direct influence in developing the Lightspeed system for Lightning Returns: Final Fantasy XIII.
 * The Japanese name for the system, Overclock, shares its name with the Limit Break system from Kingdom Hearts Re:Coded. It also functions somewhat similarly, requiring a gauge to be built up by damaging enemies.