| Chaos Emeralds/ |
The Chaos Emeralds' backstory are shrouded in mystery, and they are known to have existed for thousands of years, along with the larger Master Emerald. The games and comics have revealed that both the Echidnas and Babylonians civilizations that existed thousands of years prior to the games knew about the Chaos Emeralds, along with the Black Arms, who have visited Earth for at least 2000 years. The civilization that created Emerl over 4000 years prior to the games is also known to have been experimenting with the Chaos Emeralds. The Chaos Emeralds were named such by the remaining Echidnas due to their connection with Chaos, who destroyed their civilization. Interestingly, Chaos Emeralds not only works for heroes and villains alike, it also works on vehicles as well, whether it is close to them or come upon contact, thus bringing it to life and behave like any other Mobians would, although vehicles do not have arms, legs, eyes, arms, or any other working limbs.
See also
Chaos Emeralds on Sonic Wiki Zone