Arthra (アースラ Āsura) is a TSAB investigative location size::spaceship under the command of Lindy Harlaown in the original series, the A's manga, and appears in::A's. In the course of the final Book of Darkness incident in A's, it is retrofitted with an uses::Arc-en-ciel. In StrikerS manga, Arthra is still in service, with Chrono as her captain, but in StrikerS, TSAB already plans to scrap her. Riot Force 6 requests to use her as their temporary HQ while the Long Arch undergoes repairs.