Balcora is the massive black hole cluster where Sajuuk is located. It had so much strength that hyperspacing could not happen within a 500 light year radius, so to combat this, the Progenitors built Balcora Gate which allows a vessel to jump straight to Sajuuk. During the Vaygr War, Makaan jumped through this gate, using his Progenitor Dreadnaught to activate the gate and lead him to Sajuuk. Karan S'jet soon followed to initiate the final battle for the ancient Progenitor relic.