Master Core: ABIS (マスターコア: ABIS Masutā Koa: ABIS?) is the transformation of SCR-HD, created when SCR-HD merged with Astral Babylon's artificial black hole/core unit and the energies from the five Arks of the Cosmos. It is the final (and only) boss of Sonic Riders: Zero Gravity. After SCR-HD completed its objective by bringing the Arks of the Cosmos to Babylon Garden, it became Master Core: ABIS, only to be defeated by Team Sonic and the Babylon Rogues when they tried to stop the ship's core unit from creating a black hole that could destroy the Earth.