Rial Shif is an agent of the Jedi. You could walk around the Jedi Temple in Coruscant and ask everyone if they’ve ever heard the name Rial Shif. The answer from almost all of those present would be no and a quizzical look as to where you got that name from.
Rial Shif is as close to a Dark Jedi as you’ve ever met without falling over the precipice of the Dark Side. His teachings were considered far too borderline – edging into powerful and long hidden dark aspects of the force – to be allowed to teach the younglings. However Jedi Master Yoda understands the good in Rial Shif. His trust in Shif means he has found a unique position within the order. He wanders the space lanes, mostly out on the outer rim practicing his own brand of Jedi justice. Always short of brutal, Shif is an exacting and intimidating Jedi. All those that have crossed him have discovered that. To their cost.