Master Emerald


 * You may be looking for the Chaos Emeralds.

The Master Emerald is a powerful magical gemstone from Sonic the Hedgehog's universe that is guarded by Knuckles the Echidna. It was mentioned in Sonic the Hedgehog #251 when Knuckles and Proto Man were battling Doctor Eggman and Dr. Wily's Egg-Wily Machine X. As the machine had been empowered by the Chaos Emeralds, Knuckles lamented that the doctors hadn't stolen the Master Emerald as well so that he could use it to negate their power. By the time of Sonic Universe #76, the Master Emerald had been shattered and its fragments scattered across the planet. Sonic found one such shard near the Green Hill Zone shortly before being attacked by members of the Deadly Six.