Perfect Chaos

"If I wasn't just dreaming, that monster is a real menace!"

- Sonic the Hedgehog, Sonic Adventure

Perfect Chaos (パーフェクトカオス) is the final boss of Sonic Adventure and the second boss on the console/PC version of Sonic Generations. It is the Super State of Chaos, assumed by absorbing the negative energies of the seven Chaos Emeralds, and is Chaos's strongest form.

Around 4,000 years ago, Chaos assumed this form to destroy the Knuckles Clan and the rest of the world in vengeance, but was sealed away in the Master Emerald by Tikal. Four millennia later, when Chaos returned due to Dr. Eggman, it worked alongside the doctor so it could become Perfect Chaos again and continue its destructive rampage. It was ultimately successful in achieving this form again, but it was defeated and calmed down by Super Sonic.

Appearance
Vastly more different than any of Chaos' previous forms, Perfect Chaos is a several-stories-tall monster composed entirely of pure chaos energy in liquid form. Its main body resembles a thick snake with its head, back and sides covered in dark blue reptilian-scaled skin while its underbelly is clear liquid, and it has pointy liquid spikes extending from its back. Its head possesses a very large mouth with green razor-sharp teeth and a green tongue, which extends far beyond its eyes which are green and have slit-like pupils. It also has flaps of skin hanging from just behind its eyes, green horns on its nose area and behind its eyes, and a "fin" on top of its head containing its organic brain. Also, running from the base of its body to its back spikes and brain are green-glowing arteries. The base of its snake-like body ends in a flood of liquid with several liquid-composed tentacles extending from it.

In Sonic Adventure and its remakes, Perfect Chaos' appearance greatly differs from its modernized one. Its entire body from top to bottom is completely composed of liquid, with no distinction between the different sections of its skin, and the spikes on its back are merely blunt extensions of its "flesh". It also lacks any green coloration (except for its eyes) and arteries, and the base of its body merges with the water below it in a huge whirlpool and cyclone with only two tentacles extending from its base.

First transformation
4,000 years ago, Pachacamac, chief of the Knuckles Clan, and his men attacked the Altar of the Emeralds, home to Chaos and its family of Chao that it protected, to seize the Chaos Emeralds and the Master Emerald to destroy the Nocturnus Clan and further their war efforts. During the attack, Chaos saw them injure the Chao and Tikal, who tried to stop them, a sight that filled Chaos with anger and sadness. In revenge, it used the Chaos Emeralds' negative energies to become Perfect Chaos and killed nearly the whole Knuckles Clan, Pachacamac and his men included, while laying waste to their entire civilization overnight. However, Perfect Chaos had at that point been corrupted by blind rage and hatred and would not stop its rampage. It would eventually have moved out to destroy the rest of the world too, but it was stopped by Tikal by sealing herself and Perfect Chaos inside the Master Emerald. This returned Chaos to normal.

The effects of Perfect Chaos' first attack would over time have a significant impact on the world, such as the creation of Angel Island, the slow terminal decline of the Knuckles Clan, and the ascendancy of the Nocturnus Clan within the ancient world.

Sonic Adventure
In Sonic Adventure, Chaos was freed from the Master Emerald by Dr. Eggman, who sought to transform it into Perfect Chaos and use it as a weapon to destroy Station Square and build Eggmanland on top of it. Still brimming with rage from the attack on its shrine, Chaos remained under Eggman's command while the doctor collected the seven Chaos Emeralds for his transformation into Perfect Chaos so it could continue its rampage. When Eggman's plans failed, Chaos decided to get the Chaos Emeralds itself and rebelled against Eggman. Through swift assaults, Chaos got the Chaos Emeralds and became Perfect Chaos once more.

Perfect Chaos soon after appeared in Station Square where it began destroying it with destructive water streams, floods and giant tsunamis. Shortly into its rampage, Perfect Chaos faced a vengeful Dr. Eggman in the Egg Carrier 2. However, Perfect Chaos shot down the vessel with a single energy beam. At that point, Perfect Chaos had absorbed all of the negative chaos energy from the Chaos Emeralds and expelled them. This act proved to be Perfect Chaos' own undoing, as Sonic the Hedgehog harnessed the Chaos Emeralds' positive chaos energy to transform into Super Sonic and defeat Perfect Chaos. With its defeat, Perfect Chaos reverted back to normal and its anger and rage were neutralized by Super Sonic's power, returning it to the peaceful creature it once was.

Mario & Sonic at the Olympic Winter Games
Perfect Chaos makes a cameo as an ice sculpture in Mario & Sonic at the Olympic Winter Games during the Dream Figure Skating competition in Sonic Land. In this event, which mimics the battle against Perfect Chaos in Sonic Adventure, the participants battles the ice sculpture of Perfect Chaos as a part of their performance until it is obliterated.

Sonic Chronicles: The Dark Brotherhood
In Sonic Chronicles: The Dark Brotherhood, Perfect Chaos is mentioned by several characters at different points in the story, most noticeably about how Perfect Chaos' destruction of the Knuckles Clan allowed the Nocturnus Clan to reign supreme in the ancient world before they were banished to the Twilight Cage. Perfect Chaos is also given a profile in the codex in the game's Journal and is mentioned in several other entries as well.

Sonic Generations
Perfect Chaos serves as a boss in the game Sonic Generations, and is the main boss of the Dreamcast era. The player does not use Super Sonic in this game. Instead, the player uses Sonic and must navigate three different kinds of paths, each involving going into Perfect Chaos and coming out the top end, which damages it. Its last resort is sending platforms out of the water. These platforms fall after an allotted time, so the player must hurry and avoid falling off, and Homing Attack the top of it to end the fight.

Powers and abilities
With all the negative chaos energy from the seven Chaos Emeralds, Perfect Chaos is a mysterious and higher being possessing unprecedented size and power on a god-like scale which is said can easily lay waste to the entire world. In this form, Chaos' hydrokinetic powers have been enhanced to the point where it can control entire floods, flooding Station Square in a matter of seconds using colossal tidal waves and local water sources. It can as well manipulate water in a more delicate manner, such as conjuring up tornadoes of water or creating water sprouts strong enough to entire roads suspended.

Being made of liquid chaos energy, Perfect Chaos is nearly indestructible and can mimic the properties of water. It has complete control over its physical structure, allowing it limited shapeshifting, such as elongating its tentacles for greater range, change its shape into fluid liquid and if dissipated, it can reconstitute itself again. Additionally, it can merge with the water around it, allowing it to become one with its floods. Due to its size, Perfect Chaos also has enormous amounts of physical strength, being able to destroy entire buildings with just one strike with its tentacles.

Aside from enhanced abilities, Perfect Chaos has gained the ability to project highly destructive energy in different ways. It can fire an immense energy beam from its mouth which packs enough power to destroy the Egg Carrier 2 with a single shot, shot energy bullets from the spikes on its back which are strong enough to decimates entire buildings and project clusters of energy balls.

Perfect Chaos' weak point is its brain. Whenever it is struck, it not only causes Perfect Chaos great pain, but also makes its entire body structure tweaken and crumble. This is a highly vulnerable spot, as Sonic was able to defeat Perfect Chaos in Sonic Generations without becoming Super Sonic by attacking its brain.

Boss guide
Perfect Chaos is the final boss of Sonic Adventure, when the player has completed all six stories for each playable character. It takes place in the flooded Station Square with a cloudy sky and has two phases. It is also the only moment in the game to play as Super Sonic, who is more fast moving than his regular form. The path between the player and Perfect Chaos is a long route, where the player is only able to move during the boss battle. Some of the roadways from Speed Highway are also seen there as well, where the player is able to move. The route differs slightly depending on if the player succeeds or fails to hit Perfect Chaos' weak spot. In either case, the player moves to another section to do the same pattern.

Right at the start, the player has fifty rings on hand. Super Sonic is able to hover normally in the water. The player's goal is to gain enough speed to move towards Perfect Chaos. The playable character will automatically Spin Attack inside the beast. If the player manages to gain enough speed, he/she will spin to Perfect Chaos' weak spot, its brain, and the player moves to the next route to do the same thing. However, if the player hasn't gained enough speed, the player will fly away and has to try again in another place.

From the beginning, the player has to watch their ring count, which typically, in Super Sonic's case, will decrease one ring per second. The player can collect rings on strings, that are set on roadways with Dash Panels, which can gain more speed for the player. Super Sonic is also able to gain a small amount of speed by jumping and moving forward. When the player has gain enough speed, Super Sonic will perform a Bolt of Lightning. If the ring count manages to go zero before completing the boss battle, the player will lose a life and try again at the beginning of the battle.

Perfect Chaos has three major attacks to use against the player. The first one is shooting large, energy projectiles from its spires on its back towards the player. It can also summon large typhoons near him and its final attack is a large energy beam that it shoots from its mouth, which it used to destroy Egg Carrier 2. If the player gets hit by one of these attacks, he will get fly backwards and loses all the maximum speed that has been gained. During the first phase, the player has to hit Perfect Chaos' brain three times while the game's main theme Open Your Heart can be heard in the background. In the second phase, a more darker, orchestral theme called "Perfect CHAOS Revival!" can be heard in the background, while the battle becomes quite harder and the player has to hit the same target another three times. After this, the player has completed the game.

Archie Comics
Perfect Chaos made an appearance in the Archie Comics' Sonic the Hedgehog, as a part of the comics adaption of Sonic Adventure. Just like in the games, Chaos, in a state of outrage, transformed into Perfect Chaos for the first time when the Knuckles Clan attacked his home and friends, but was stopped by Tikal and the Servers and sealed in the Ancient Onyx.

Centuries later, Chaos was freed by Dr. Eggman and they began hunting down the Super Emeralds to make Chaos become Perfect Chaos. Eventually, Chaos went after the Super Emeralds alone and managed to acquire all seven of them, becoming Perfect Chaos once more.

Not long after transforming, Perfect Chaos began laying waste to Station Square. Thanks to the efforts of Tikal, however, Perfect Chaos lost the Super Emeralds, and Sonic the Hedgehog used them to become Super Sonic, and began fighting Perfect Chaos. Eventually, Perfect Chaos was defeated when Super Sonic pushed it into a power plant, where it was electrocuted and returned to normal.

Sonic X
In the anime series Sonic X and its comic series published by Archie Comics, Perfect Chaos appeared as a part of the series' adaptation of Sonic Adventure. In this media, Perfect Chaos has an increased "back" size and several new tentacles. It also possesses additional abilities, like absorbing attacks, creating crystal spires of water and generate force-fields.

Much like in the games, Chaos transformed into Perfect Chaos to destroy Pachacamac and his tribe after they forcefully invaded its home. It would not stop its rampage though, so Tikal sealed it inside the Master Emerald. Generations later, Perfect Chaos emerged again, this time on earth, due to Dr. Eggman, but it was defeated and calmed by Super Sonic.

In the comic series, Perfect Chaos appeared again when Dr. Eggman forced it to transform while fusing it with his Greenbots, creating the machine-hybrid Chaosbot which obeyed his commands. However, Perfect Chaos had free will restored and its body released from the robots thanks to Super Sonic.

Sonic the Comic
In Sonic the Comic, Perfect Chaos appeared as the series' final foe. In this media, it resembles a large, bulky squid and possesses additionally a fear effect and reality warping abilities.

After Dr. Ivo Robotnik gathered the Chaos Emeralds with his Chaos Resonator, Chaos followed the emeralds there and appeared before them when Sonic and his friends confronted Dr. Robotnik. Chaos quickly absorbed the Chaos Emeralds, becoming Perfect Chaos, and began reshaping Mobius in his own image. All seemed lost, as Sonic and his friends were unable to stop Perfect Chaos, but then Super Sonic arrived and defeated Perfect Chaos by jumping into him and absorbing all of his chaos energy, thus returning him to his original Drakon form.

Trivia

 * It has been explained that Perfect Chaos' design in Sonic Generations was how it was originally meant to look like in Sonic Adventure, but due to the technological restraints with the Dreamcast at that time, it was not possible.
 * The song Open Your Heart is played during the battle with Perfect Chaos and a remix is played in Sonic Generations.
 * Perfect Chaos's roar in Sonic Generations sounds more like a shriek than a roar.
 * The Perfect Chaos battle in Sonic Adventure only takes about six hits to defeat, despite it being a final boss. This is because Sega could not make the boss harder with the Dreamcast's capabilities.
 * There is unused attack by Perfect Chaos seen in the game files where Perfect Chaos launch a small arm from the floods to attack Super Sonic, though the attack is not fully finished.
 * Perfect Chaos's destruction of a city, large appearance and powerful attacks such as a mouth beam makes Perfect Chaos highly reminiscent of Kaiju, giant monsters portrayed in Japanese media such as the creature Godzilla. In particular, Perfect Chaos bears a resemblance to the Kaiju Biollante from the Godzilla film series.
 * Until Sonic the Hedgehog, Perfect Chaos was the last main villain/final boss to directly use the Chaos Emeralds to transform: The Biolizard instead merged with the ARK after using Chaos Control, Metal Madness/Metal Overlord was not shown using the Chaos Emeralds to transform (and the former was explicitly stated to have not used the Chaos Emeralds by Dr. Eggman), and Black Doom admitted that he underestimated the Chaos Emeralds' powers during his fight as Devil Doom.