The Cicatrix!

Fragile deployable ring(s) that harness quantum supercomputers to rip holes in spacetime. It takes time to charge, creates major amounts of heat requiring large and fragile heatsinks. When not being used, functions as the ship's main processing power. More rings rips a wormhole faster, at the cost of increased charging time.

An ion thruster, ion drive, or ion engine is a form of electric propulsion used for spacecraft propulsion. An ion thruster creates a cloud of positive ions from a neutral gas by ionizing it to extract some electrons from its atoms. The ions are then accelerated using electricity to create thrust.

A cryogenic rocket engine is a rocket engine that uses a cryogenic fuel and oxidizer; that is, both its fuel and oxidizer are gases which have been liquefied and are stored at very low temperatures.

A pressurized water reactor (PWR) is a type of light-water nuclear reactor. In a PWR, the primary coolant (water) is pumped under high pressure to the reactor core where it is heated by the energy released by the fission of atoms. The heated, high pressure water then flows to a steam generator, where it transfers its thermal energy to lower pressure water of a secondary system where steam is generated