Cronal

Cronal, a male Human and former Prophet of the Dark Side, was the true identity of Agent Blackhole, a mysterious Imperial Intelligence agent who collaborated with Darth Vader after the Battle of Yavin to locate Rebel Alliance bases. 
==Biography==
Blackhole's exact appearance and identity remained unknown to all but a few; to most he spoke to, he appeared only as a Human-shaped cloud of stars with the help of an image distorter.
Agent Blackhole was one of the powerful Emperor's Hands, and given virtually unlimited access and control over the Imperial HoloNet. The Blackhole troopers carried out his most well-known exercises of power.
As a Prophet, he had helped train both his own daughter, Sariss, and also the Dark Jedi Jerec. He was later hand-picked by Palpatine to be the head of Imperial Intelligence. It was rumored that Blackhole was once a Senatorial page taken under Palpatine's wing. Another rumor asserts that he was an assistant at the Jedi Archives on Coruscant who was ultimately seduced by the dark side of the Force. In reality, Blackhole was an extremely frail old man, whose only movements were assisted by a mechanical chair designed by the Neimoidians. 
A few months after the Battle of Yavin, he was tasked with finding the Alliance fleet. His search led him to uncover a rebel mission to Vorzyd V, where he was outmaneuvered by operatives Luke Skywalker and Leia Organa. 
After the Battle of Endor and Palpatine's death, Blackhole seemingly disappeared without a trace. In truth, he swore loyalty to the Emperor when he was reborn on Byss, on whose behalf he helped establish the Church of the Dark Side and also recruited Jerec to locate the lost Valley of the Jedi. His fate after the final death of Emperor Palpatine is unknown. New Republic Intelligence concluded that he simply died, but he was later identified as the Dark Jedi who helped transform Irek Ismaren into Lord Nyax. This would seem to imply Cronal was still active as of the Yuuzhan Vong War. His activities after that are unknown.
Blackhole was a master of Sith Alchemy. He created Sithspawn such as Gorc and Pic. Blackhole's abilities earned him the moniker "Palpatine's Monster Maker".