Master Core: ABIS

is the twisted transformation of SCR-HD, which was created when SCR-HD merged with Astral Babylon's artificial black hole/core unit and the energies from the five Arks of the Cosmos, and is the final (and only) boss of Sonic Riders: Zero Gravity.

After SCH-HD completed the objective of bringing the Arks of the Cosmos to Babylon Garden, it became Master Core: ABIS and tried to prevent Team Sonic and the Babylon Rogues from stopping the ship's core unit, which was about to create a black hole that would destroy the Earth, but was defeated by the Extreme Gear riders.

History
Near the end of Sonic Riders: Zero Gravity, SCR-HD suddenly appeared at Crimson Crater, though heavily damaged, and stole all five Arks of the Cosmos from Wave. Still acting according to the objective given to it from the Arks of the Cosmos, SCR-HD made a quick escape from the Crimson Crater and brought all the Arks of the Cosmos back to Babylon Garden. This made Babylon Garden transform into Astral Babylon, and as well made the core unit of Babylon Garden create a black hole that threaten to consume the planet. In the process, through the Arks of the Cosmos' influence and power, SCH-HD merged with the core unit, the very core of the black hole, and transformed into the twisted Master Core: ABIS.

Soon after transforming, Master Core: ABIS was confronted by Sonic, Jet with their respective team on the Mobius Strip, who had come to disconnect the core unit and thereby stop the black hole from destroying the world. However, as Master Core: ABIS had merged with the core unit, they were forced to fight it to stop the black hole. Master Core: ABIS fought back however, and even tried to use the Arks of the Cosmos' gravity manipulating abilities against them. Sonic and co. however managed to use this power against Master Core: ABIS by flying into it and thereby damage it.

Eventually, Master Core: ABIS was defeated by Sonic, Jet and the others, where it then was consumed by the black hole it had created, thus disappearing into nothingness. This stopped the black hole from consuming the Earth, and all returned to normal.

Powers and Abilities
By absorbing the energies from the five Arks of the Cosmos and the core unit of Babylon Garden, Master Core: ABIS is granted powers and abilities far beyond its normal form. Through being connected to the black hole created by the Arks of the Cosmos, Master Core: ABIS can utilize their gravity manipulating properties to perform Gravity Drive, but on a much larger scale than Sonic or Jet can do, and can completely distort gravity in a large radius and tear the environment apart through gravity shifts.

Besides gravity manipulation, Master Core: ABIS can form large yellow energy bolts and shoot them at its opponents. It can also create and gather giant blocks of molten rock and throw them like meteors at its opponents, which create large explosions upon impact. It has also shown the ability to teleport over short distances.

Battle
The battle with Master Core: ABIS is similar to that of the Babylon Guardian, but is considered much harder. It has 6 hit points, which is double what the Babylon Guardian had, and the only way to hit it is to take advantage of its Gravity Dive and hit the sphere underneath it, similar to the Babylon Guardian's vase.

Trivia

 * Master Core: ABIS' name is derived from both its symbiotic relation to the black hole's core, and "Abyss", a common description for endless stretches of empty space.
 * ABIS somewhat resembles Metal Overlord.
 * It is possible for SCR-HD to fight ABIS, despite ABIS actually being SCR-HD.
 * Master Core: ABIS may have 6 hit points in story mode, but if you choose to race this course outside of the story, one lap requires 2 hits to advance to the next one. Choosing to do 99 laps gives you the option of having to do 198 hits to finish the race.
 * Master Core ABIS looks diffrent in the 2 versions. In the Wii version his face is Completely Metalic however in the Playstation 2 version his face is a bunch of wires and a red glowing dot