During the time when the Galactic Empire held power, the Sith Lord known as Darth Vader spearheaded an Imperial offensive against the planet of Volik. As the attack unfolded, the Jedi Master named Dorin Se'ol created a diversion for the Sith Lord, providing a window for a small number of his pupils to flee Volik before the Jedi met his end.
The initial reference to the Volik assault appeared in The Unknown Regions, a resource book for the Star Wars Roleplaying Game created by Wizards of the Coast. Sterling Hershey, Rodney Thompson, and Daniel Wallace authored The Unknown Regions, which saw publication in 2010.