- "You see? That indicates a hypermatter particle leak. The damage is at a microscopic level, likely localized to one of the several hundred radiation refractors in the Thunderstrike. It's not enough to impact efficiency—but it could leave a trail for Darth Vader to follow."
- ―M2-M5, engineering droid of the Sixty-First Mobile Infantry
Hypermatter was a fuel for use in hyperdrives. The main materials of hypermatter could be formed when solar radiation came into contact with the core of a planet, as is the case in the Redhurne system. On the cores of the inner planets of the Redhurne system, hypermatter was collected by mining droids for use by the Galactic Empire. A hypermatter leak in a starship's radiation refractors could leave a trail of particles that could be found and followed.
- Tarkin (First mentioned)
- Rogue One: A Star Wars Story novel (Mentioned only)
- Battlefront: Twilight Company (Mentioned only)