Cybloc XII was the twelfth moon of the planet Cybloc in Meridian sector. The small moon had a rotation period which was almost synchronous with its orbit, resulting in a long day-night cycle.

The New Republic established a base on Cybloc XII which served as a major trade hub between the New Republic and the neutral worlds in Meridian Sector. It was the home base of Transit Galactic Shipping. Most of the population was killed when Seti Ashgad and Dzym released the Death Seed plague throughout Meridian Sector in 13 ABY. As the plague spread there was considerable looting by various fringe elements using protective clothing to avoid infection.