Master Core: ABIS

Master Core: ABIS is the final, and only boss in the game Sonic Riders: Zero Gravity. Originally SCR-HD, he stole all five Arks of the Cosmos and created a black hole in the Babylon Garden. Sonic, Jet and co. raced to the Garden and confronted SCR-HD, now Master Core: ABIS, on the Mobius Strip.

The battle with Master Core: ABIS is similar to that of the Babylon Guardian, but is considered much harder. He has 6 health, which is double what the Babylon Guardian had, and the only way to hit him is to take advantage of his Gravity Dive and his the sphere underneath him, similar to the Babylon Guardian's vase. When he is defeated SCR-HD/Master Core: ABIS disappears into the black hole forever, and all is returned to normal.

Master Core: ABIS can activate Gravity Drive, thanks to the Arks of the Cosmos, as well as throw balls of energy, and summon meteor storms.