The Chaos Emeralds

The Chaos Emeralds are 7 mystical gemstones of incredible power. Alone they can power machinery and unlock hidden talents. Together they can create miracles and catastrophes.

How they came to Equestria
When Eggman decided to set a base of operations in Equestria in order to better locate the Elements of Harmony and use their power to rule it, he inexplicably caused Sonic and his friends to be sucked in with him. The Emeralds followed them in, Master Emerald included. They then scattered throughout Equestria where Trixie came across the red emerald and became corrupt.



Corruption
Corruption is caused when one is afflicted with a grave emotional wound. Leaving a figurative hole in their heart, the emerald fills this hole when their negative attitude calls upon the power of the emerald in possession. Like a drug, the more you take it the less likely you are to quit it. For the energy numbs the pain as it fills the void, this causes those corrupted to become a ticking time bomb of power, hell bent on getting even with what they feel is the reason for their pain.

Symptoms include the Radiation of the energy, markings that are the same color as the emerald that corrupted them, starting with their eyes and face, progressively filling their body with tribal like markings and sclera that are the same color as the emerald. Once at 100% corruption the host will die and most likely explode violently with all that energy.

Trixie was close to this, being at about 80% before Shadow managed to remove all but the small percentage that was permanently imbedded in her. Garble will be the second victim to the corruption, the reason why is unknown for now.

Diamond Tiara was not only corrupted, but was the vessel for Nazo in the Wrath of Nazo Special.