The Super Emeralds are the Chaos Emeralds, amplified by the Master Emerald.
History[]
While the Chaos Emeralds and Master Emerald have been on the same planet for generations, the only time in the past the Super Emeralds had ever been formed was during the last years of the Ancients, which had formed them during experiments with the two brought together. The Ancients sadly didn't live long enough to fully understand the Super Emeralds, and they were left behind with the Master Emerald until the ancient echidna tribes discovered the Master Emerald, the Chaos Emeralds, and the shells of the Super Emeralds. They kept the Chaos and Master Emeralds in a shrine, while leaving the shells deep underground in a special vault. Eventually though, one Echidna tribe attempted to take the power of the Emeralds for themselves, drew the wrath of Chaos, and the echidnas were nearly wiped out. To attempt to appease the wrath of Chaos, the remaining echidnas brought the Master Emerald into the vault as well, which would age into the Hidden Palace, and assigned guardians to defend it, while the Chaos Emeralds were scattered. This would continue until the era of the last echidna, Knuckles, where the Master Emerald would be returned to the ancestral shrine, and the Chaos Emeralds would undergo serious study. Over time, the link between the Master and Chaos Emeralds would be understood, and eventually documents about the Super Emeralds would be uncovered. Not too long after, the Super Emeralds would be formed to fight The End. Aside from research based on the data from The End's fight, the Super Emeralds weren't used again until the Dimensional Merge, formed to boost Sonic and his allies to help the Dimensional Heroes.
Powers[]
The Super Emeralds are far stronger than the Chaos Emeralds, though weaker than the Master Emerald.
The Hyper Forms granted through their use are not all that much stronger than a Super Form, however, but they are far more durable and allow for enhanced Chaos Energy control, up to controlling how much of Positive or Negative Chaos Energy is used in Chaos techniques. As well, users are sent into a calm and focused state for the form's duration, enhancing their control over the form's power even more.
Limitations[]
The Super Emeralds are not their own gem to find, but rather enhanced Chaos Emeralds. This means you need the Chaos Emeralds and Master Emerald in the same place. As well, someone with a deep connection to the Master Emerald is required to transform the Chaos Emeralds into Super Emeralds. The Super Emeralds are only one use, and will revert into Chaos Emeralds upon the form expiring. And finally, it takes a lot of the Master Emerald's power to craft the Super Emeralds, which means they cannot be reformed for several months after without destroying the Master Emerald.