Ahsoka introduces two new villains to the galaxy far, far away, in the form of Baylan Skoll and Shin Hati. These two fearsome antagonists were initially glimpsed in the Star Wars series' first teaser trailer, which saw them wielding their orange-bladed lightsabers as they tore through the forces of the New Republic. It was soon revealed that Baylan is a former Jedi, who survived Order 66, and Shin is his apprentice.
Source：https://www.cbr.com/ahsoka-dark-jedi-differences-star-wars/
