Master Emerald

The Master Emerald (マスターエメラルド) is a large, green emerald depicted in the Sonic the Hedgehog video games, cartoons and comic book series.

Origin in the games
Little is known about the origin of the Master Emerald except that it has resided in a shrine on Angel Island for an unspecified amount of time, guarded by Knuckles the Echidna. It was created by the gods, because they saw that people were using the Chaos Emeralds for evil, and equipped the gem to be able to negate the energy of the Chaos Emeralds. It has been in existence for thousands of years (at least since the time the Knuckles Tribe Echidnas were thriving) and has a large connection to the equally mysterious Chaos Emeralds, along with the being known as Chaos.

Purpose
The Master Emerald has unbound and infinite power, and is used to keep Angel Island afloat in the sky. The Emerald also has the power to fully control everything that the Chaos Emeralds do. The Emerald also possesses the ability to both negate and empower Chaos Emeralds, meaning it can stop the energy of the Chaos Emeralds, or enhance them. The Master Emerald has also been seen creating three-dimensional holographic images within itself (thus suggesting that the Master Emerald is in fact sentient). In addition, if the Master Emerald is broken into several pieces, it can repair itself if the shards are brought back together. However, the shattering of the emerald seems to give the shards an explosive trajectory, causing them to fly a great distance which makes the task of gathering them rather painstaking.

Only Knuckles, Chaos and Tikal have been seen to be able to talk to, command, and control the Master Emerald.

Role in the games
First appearing in Sonic & Knuckles, the Master Emerald would go on to play a crucial role throughout the rest of the series.

Sonic 3 & Knuckles


The Master Emerald could be seen early in Sonic 3 & Knuckles being used to create Super Emeralds from Chaos Emeralds if the player accessed Special Stages. It would appear later being stolen from its altar by Dr. Ivo "Eggman" Robotnik to power his Death Egg, a doomsday weapon. It was retrieved by Sonic or Tails (depending on the player's choice) and was returned to Angel Island.

In Knuckles' playthrough, which occurs after Sonic or Tails' playthrough (due to the lack of a Death Egg and the fact that Sonic and Knuckles are friends), the Master Emerald is again stolen, this time by one of Eggman's remaining badniks, although it seems to have been part of a deal with the Sonic-shaped robot Mecha Sonic, that Sonic or Tails battled earlier. Mecha Sonic used the Master Emerald to significantly augment his powers, turning into a super-like state. "Super Mecha Sonic" was defeated by Knuckles anyway, as Mecha Sonic occasionally had to go back to the Emerald to recharge, since he couldn't absorb all the power into his being. As soon as Knuckles defeated Mecha Sonic, the area the two were on crumbled, but Sonic appeared in his biplane to save Knuckles and the Master Emerald, and it was again brought back to Angel Island.

Sonic Adventure
The Master Emerald appeared again in Sonic Adventure for the Sega Dreamcast, where it was again shown keeping Angel Island afloat. The Emerald also held within it the ancient monster known as Chaos along with the ancient controller of the Master Emerald and the Chaos Emeralds, and an echidna girl called Tikal. In the game, it was shattered by Dr. Robotnik to release Chaos, causing Angel Island to fall. In the duration of the game's storyarc, Knuckles collects the shattered pieces of the Master Emerald from a variety of locations, and ultimately repairs the Emerald.

Sonic Adventure also revealed that 4,000 years ago, the Knuckles Tribe Echidna had tried to steal the Master Emerald along with the Chaos Emeralds, both in an altar on the outskirts of the Tribe's city, in order to obtain ultimate power. To do this, they had to drive away the Chao that lived there. Chaos, who was their guardian, appeared and destroyed most of the Knuckles Tribe in a fit of rage, and in order to stop him, Tikal pleaded with the Master Emerald to calm him down. The Emerald then absorbed both Chaos and Tikal into itself, and continued to surge energy into a large part of the continent, making it float into the air with the remaining Echidnas, producing what is now Angel Island.

Sonic Adventure 2
The Master Emerald was again a source of contention as Knuckles fought with Rouge the Bat for possession of it in Sonic Adventure 2. Doctor Eggman tried to steal it again while they were distracted, but Knuckles voluntarily shattered the Emerald in order to keep it out of his hands. Knuckles and Rouge then set off separately to gather the shards of the Emerald for their own reasons.

Once all the pieces had been collected the Emerald was reformed by Knuckles. When Space Colony ARK started to fall (due to an automatic system when all seven Chaos Emeralds were gathered in the central control room), Knuckles used the Master Emerald to try to stop the disaster in the Eclipse Cannon's Core, which resembled the Emerald Shrine on Angel Island, to negate the Chaos Emeralds' power.

Sonic Battle
When Sonic went to fight Emerl on the Death Egg in Sonic Battle, he brought the Master Emerald with him, hoping it would negate the Chaos Emeralds that powered Emerl. However, the Master Emerald was shattered by a crazed Emerl, as he was bothered by the light it produced. It was most likely put together again, as it appears in Sonic Advance 3, which is very likely situated after Sonic Battle.

When the Master Emerald appears, Sonic says "a Master Emerald!". This is most likely a translation error, especially because in the next sentence he refers to it as "the Master Emerald."

Sonic Heroes
The Master Emerald played no role in Sonic Heroes, but it was mentioned by Rouge the Bat in the last movie of Team Dark's Story. She says she "might as well go after that Master Emerald, since that irritating ECHIDNA is here!". Shadow responds, saying, "Some things never change, do they?"

Sonic Advance 3
The Master Emerald then had a somewhat important role in Sonic Advance 3. After Eggman uses Chaos Control to split the world into seven parts, Sonic and Tails travel to the Master Emerald in order to use its Chaos Emerald-negating powers to undo the changes. After the heroes find it, the final boss is then fought at the Master Emerald altar. After the boss is defeated, the Master Emerald releases a bright light and repairs the world.

Sonic Rivals
In the Sony PSP game Sonic Rivals, Eggman Nega, masquerading as Eggman, stole the Master Emerald and used a special camera to turn it into a card, forcing Knuckles to find him and get it back. The game also stated that the Master Emerald exists in all moments in time simultaneously, so when Eggman Nega transformed the Emerald into a card in one moment in time, it disappeared from all other points in time. The Master Emerald is also one of the 150 collectible cards in the game.

Sonic Rivals 2
In Sonic Rivals 2, the Master Emerald was once again stolen. Working with Rouge, Knuckles uses an Emerald detector he found to help locate the Master Emerald without luck, as it's revealed at the end of the game the Master Emerald is in fact inside the detector. It is also in the card "Knuckles and the Master Emerald", but strangely, only Knuckles is shown on the card. This is because it is a cropped image from Sonic Adventure.

Sonic Chronicles: The Dark Brotherhood
In Sonic Chronicles: The Dark Brotherhood, Pir'Oth Ix uses the Master Emerald to create a gateway to the Twilight Cage and at the end of the game he uses either the Chaos Emeralds or the Master Emerald to transform into Super Ix. Later, Knuckles takes the Emerald back.

Size dispute
The Master Emerald's size and shape seems to change over time. It is larger than Knuckles in Sonic 3 and Knuckles and Sonic Adventure, but about the same size as him in Sonic Adventure 2 (the shards themselves being around the volumetric equivalent of the Chaos emeralds). Then, after Knuckles restores it at the end of Sonic Adventure 2, he pulls it out of his person to explain how to use it to stop the Space Colony ARK from plummeting to Earth, and it's about the size of his hand (he likely has the ability to shrink it down to a portable size). Then, after Shadow defeats the Biolizard, Knuckles puts the Master Emerald into the core and it is slightly larger than Knuckles. The Adventure games also have a slight color difference; Sonic Adventure features an opaque, dark green Master Emerald, while Sonic Adventure 2 features a light, transparent green Master Emerald. In Sonic Battle, the same green Chaos Emerald Sprite was used for the Master Emerald. In Sonic Rivals 2, it was small enough to fit inside Eggman's Emerald Detector. In Sonic Chronicles, the Master Emerald is much smaller than previous incarnations, being about the same size as a Chaos Emerald.

Role in the TV series
The Master Emerald has only appeared in one Sonic the Hedgehog television program, namely Sonic X.

Sonic X
The Master Emerald doesn't play an important role in the early part of Sonic X. However, after a giant Chaos Control brings the worlds of Sonic and Earth together, it appears on Earth along with Angel Island. It is then shattered by the release of Chaos, leading to Knuckles' search for the fragments across various areas, based on the plot of Sonic Adventure. Following the game's plot further, it served to contain Chaos and Tikal, shows certain individuals visions of the past, and is eventually put together.

Later, the anime adapts Sonic Adventure 2, and the Master Emerald is stolen by Rouge the Bat (unlike the game, it is never shattered) and taken to Space Colony ARK. Knuckles follows and battles her, and wins the Emerald back. Later, Knuckles uses it to drain the Chaos Emeralds of power, shutting down the engines that propel the colony towards the planet.

In the second series, the Master Emerald first serves as the power source for Christopher Thorndyke's crossover into Sonic's world. As a result of the time difference, the six years Chris has aged back in his world are stored inside the Master Emerald, returning him to his childish appearance, at least that was Eggman's theory. The Master Emerald also serves to power the Blue Typhoon space ship, which Sonic and co. use to travel around the galaxy and battle the Metarex. It's most important use is to power the Sonic Power Cannon, a massive cannon that is one of the few weapons effective against Metarex. The Master Emerald is left shattered and powerless after an attempt to use the Sonic Power Cannon to destroy Metarex leader Dark Oak. Oak absorbs the energy and fuses with Chaos, while Chris' age data is corrupted, preventing him from returning home through that method.

Role in the comics
As with the Chaos Emeralds, the Master Emerald appears in the comics as well as the games and television series.

Sonic the Hedgehog (Archie)


In the Archie-published Sonic the Hedgehog comics, the Master Emerald was created after Miles "Tails" Prower used the Chaos Syphon to collect the energies of Mammoth Mogul, Enerjak, and Angel Island's Chaos Emeralds. As a result, the Master Emerald has the power of fourteen Chaos Emeralds. As with the Chaos Emeralds that kept the Island aloft before it, the Master Emerald is protected by Knuckles, and also by his relatives in the Brotherhood of Guardians. As such a massive power source, it has been targeted by many villains, including Dr. Eggman. Currently, the Master Emerald is in the care of Knuckles' father Locke and the Dark Legion, following the repulsion of Eggman from Angel Island and the disappearance of the rest of the Brotherhood. The Master Emerald has been involved in several plots, and was used to give more power to Chaos and provided Evil Sonic with the energy to become Scourge the Hedgehog. It was also the only Emerald to be rescued from A.D.A.M.'s summons, an effort brought about by the efforts of both Locke and Dr. Finitevus. Finitevus later secured stewardship of the gem, fooling Locke into handing the duties over to him by having the Destructix attack a group of Dingoes. His intention: to use the power of the Emerald to restore Dimitri-who had once been Enerjak, but lost his powers to Mammoth Mogul-to his former glory. However, Finitevus soon revealed that he had fooled Dimitri-as well as Dark Legion leaders Remington and Lien-Da-into thinking that he would give them the Emerald's power, when in fact his intent was to use it to brainwash Knuckles into becoming a new Enerjak. His plan succeeded, and the new Enerjak went on a reign of terror before being confronted by Super Sonic, who was able to thwart the spell Finitevus had placed on the Emerald to avoid being affected as Knuckles had been. The resulting battle resulted in the separation of the Master Emerald's Shrine from the rest of Angel Island. Finitevus then revealed that his spell on the Master Emerald-and thus on Knuckles-could only be unlocked by the sacrifice of a person's life. Locke chose to lay down his own life to rescue his son, dying to undo Finitevus' spell. The Master Emerald has since been left in its new position on Shrine Island, which the Chaotix connected to the rest of Angel Island by building a bridge.

Sonic the Comic
In Sonic the Comic, the Master Emerald is not an eighth emerald separate from the main group of seven, but is rather the green Chaos Emerald at the peak of its power. While it is the most powerful emerald, it does not have any particular powers of control over the others, this role being filled by the Grey Emerald. As in other continuities, the Floating Island will fall out of the sky if it does not have the Master Emerald to power it, although this does not happen immediately: once when the Emerald was stolen, Knuckles was still able to pilot the Floating Island and activate an ancient weapon system, with which he destroyed the newly-rebuilt Death Egg.

The Master Emerald was first mentioned as a distinct entity when Doctor Robotnik sent Metallix to steal it so that he could use it to power his Death Egg. Sonic was able to recover the Emerald, which he then used as a bargaining chip to convince Knuckles to allow the Emerald Hill Folk to settle in the Mushroom Hill Zone.

The original Master Emerald was destroyed and its power absorbed by a robot under the command of Doctor Zachary; the robot's severed head acted as a substitute until Knuckles constructed a new Emerald and transferred the robot's absorbed Chaos Energy into it.

Trivia

 * According to a prototype plotline shown on Sonic HQ for the Archie Comics post issue #134, a second powerful jewel known as the Master Geode would later be introduced. This gem would have become a point of conflict for Mammoth Mogul, Dr. Eggman, the Iron Queen, and Rouge the Bat before being shattered. Knuckles would have gained omnipotence from exposure to the gem, and could absorb power from its fragments. However, given that most of the other plots in this article have been rendered impossible, it seems unlikely that the Master Geode will ever make an appearance.
 * In Sonic Adventure, after beating the game, the player can visit the Emerald Altar on Angel Island and see the incomplete Master Emerald with a small chunk missing (as a select few characters). However, when Knuckles goes to the altar, it is 100% complete. It is also 100% complete with Sonic in the Super Sonic story.
 * The Master Emerald has been used to transform a character into a super form at least twice in the game series. Once by Mecha Sonic in Sonic and Knuckles, and once by Ix in Sonic Chronicles: The Dark Brotherhood.
 * The Master Emerald is constantly being stolen, and was broken twice (Sonic Adventure, and once in Sonic Adventure 2 and thus Sonic X).
 * It was shown that Knuckles and maybe other guardians could change the size of the Master Emerald, as shown in Sonic Adventure 2 when it was about as big as Knuckles and Rouge at one point, and about the size of a Chaos Emerald in another.
 * Since it has the same properties as the Chaos Emeralds, characters have been seen using it's power to go Super at various points in the Archie comics. Even Ray jumped on top the Master Emerald and pretended to use it's power to go "Super Ray" to scare the Flying Dingoes.
 * If one were to preform a glitch with Tails in Sonic Adventure, the Master Emerald would be completely gone from the altar.
 * It is possible that the Master Emerald, much like the Chaos Emeralds, is sentient. As Knuckles has been seen talking to the Master Emerald a few times and in Sonic Adventure, the Master Emerald showed Knuckles a holographic image of the Egg Carrier, where he found the remaining pieces of the Master Emerald.
 * In Sonic underground the Master Emerald was change to a Chaos Emerald.