Thanos's mothership was called Sanctuary II. It was over 6,500 meters wide, and from the front, it resembled a broad, thick manta ray with its wings spread. Its mothership used subspace collapses generated by plasma reactors for faster-than-light travel. Its onboard holographic AI system could display the history, technology, and civilization data of nearly the entire Milky Way, as well as cosmic star charts of multiple galaxies—records of the many advanced civilizations Thanos had passed through and destroyed.