Cronal

Cronal, supposedly born as Perek, was a Human male and former Prophet of the Dark Side who was better known by his code name Blackhole, the mysterious Director of Imperial Intelligence. He also collaborated with Darth Vader after the Battle of Yavin to eliminate the Rebel Alliance. Adept at divination, Cronal was recruited by Emperor Palpatine from the Prophets to join the Empire. He abandoned himself to his meditations in the dark side, becoming withdrawn, physically frail, and paranoid. Considered Palpatine's "monster maker," Cronal was responsible for the creation of several Sithspawn and other devices of Sith alchemy. As time passed, Cronal withdrew further, growing steadily more mad as the dark side consumed him.

After being exiled during the Galactic Civil War, Cronal returned as a warlord, and created the identity of Lord Shadowspawn. With a cadre of the Emperor's Royal Guards and a legion of shadow stormtroopers at his disposal, Shadowspawn laid waste to worlds of the New Republic. He and his splinter Imperial faction blazed a path of death and destruction, committing acts of piracy, terrorism, and mass slaughter. Conquering the Inner Rim, the warlord established his base of operations on the world of Mindor. The New Republic, responding to the threat of Shadowspawn, sent the newly appointed General Luke Skywalker after him, starting a campaign that resulted in a substantial loss of life. Planning a trap for Skywalker on Mindor, Shadowspawn was defeated during the ensuing battle, where he perished. However, through means of the Force, he revived himself and later served the reborn Palpatine.

Text and facts from the “Cronal” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.