The Negative Drive is an interstellar engine capable of reaching a maximum speed of 400 million times the speed of light. Engineered by Noriko Null, the Negative Drive draws power directly from the Null Zone and it’s the secondary engine of the Ragnarok.
It is extremely dangerous to use: it utilizes so much power than any mistake could release thousands of megatons of destructive force. Continuous use has the risk to make the engine explode, and turning it on and off risks cutting off the connection to the Null Zone making it even more unstable.
It is also used in the construction of Black Hole Generators.
Despite it flaws, the Negative Drive is by far the fastest engine in the Olympian Galaxy.