Named Arc-Gurren (アークグレン, Āku-Guren?) by Rossiu, this is one of Lordgenome\'s Gunmen battleships, a Dai-Gun, which his armies used when he was a Spiral Warrior in events prior to the series. Enormous in size, it is initially used to gather as hundreds of thousands of animals and people onto it as possible to escape world-destroying events later in the series. It uses Spiral Energy to run and only recognizes Lordgenome as its operator. It is capable of going into space for at least a year, and contains an array of large-scale defensive systems and weaponry. When Simon uses the Gurren Lagann to merge into the Arc-Gurren, he converts the Dai-Gun into a Dai-Gunman called the Arc-Gurren Lagann (アークグレンラガン, Āku-Guren Ragan?), powered up by one of the Gurren Lagann\'s Giga Drills similar to how the Lagann is powered by Simon\'s Core Drill. The power of this Gunmen isn\'t fully displayed in the series, but it has the ability to rip the fabric of space-time itself through its sheer brute force on its debut. The Arc-Gurren Lagann is usually used exclusively by Simon and Viral, in the Gurren-Lagann. It can form massive drills or fight with punches. The Arc Gurren-Lagann resembles the Gunbuster, another giant mecha produced by GAINAX. Source : Wikipedia