Elements of Harmony

The Elements of Harmony are six powerful items that contain the most powerful magic of Equestria. If all six are put together, and are used with the true power of friendship, they can reach almost unlimited power.

Usage
In The Science of Metal Madness, Bright Spark steals the Elements of Harmony and uses them as a power source for his robot factories. However, each time the Locked Room Gang managed to collect one of the elements, the magic contained in the element restored the natural environments that had been polluted and destroyed by Bright Spark, until they finally restored the entire map. It's unsure what happened to then after.