Corak is not known as "the Mysterious" for nothing: little is known about his past. He has travelled among the stars, through countless worlds, meeting their denizens and charting their lands. In truth, Corak is a guardian, an advanced being created by the Ancients to oversee their Great Experiment. Corak's journey has one secret purpose: to track down the rogue Guardian Sheltem.
Corak is a Guardian created by the Ancients, whose main role is to repair the faulty Sheltem unit, the corrupted guardian of Terra. Corak manages to capture him, and investigates Sheltem only to find that his conditioning is faulty, and a basic error in the programming is causing him to malfunction. Sheltem, however, escapes from his captor, and flees to VARN, beginning the Might and Magic: Secret of the Inner Sanctum plot, which continues through CRON to Might and Magic V: Darkside of Xeen, and makes an appearance in Might and Magic VIII: Day of the Destroyer. Corak's role becomes to follow Sheltem through the series and exterminate him, travelling through space and time to capture the villain.
See Sheltem for more detailed information.