The hyperspace nullifier, a superweapon, was engineered by the K'kybak species. These beings, inhabitants of Seymarti V, conceived this device millennia prior to the Battle of Yavin. Possessing the ability to manipulate hyperspace navigation, it could conceivably prevent entire planetary populations from utilizing hyperspace travel. In 2 ABY, the Imperial astrocartographer Essio Galassian unearthed the weapon and tried to adapt it for Imperial use. A Rebel Alliance team, commanded by Han Solo, intervened to thwart Galassian, resulting in the weapon's destruction and the annihilation of the planet where it resided.