Mase was a male Zabrak who served as the commander of the Rebel Wolf Squadron during the time of the Galactic Civil War.
Mase commanded his squadron from Annamar, a small planetoid concealed in a large asteroid field close to the Corellian Trade Spine.
He spearheaded multiple assaults against Imperial transports, notably the attack on a convoy transporting a component for the Death Star II's weaponry.
When Darth Vader destroyed the Rebel base positioned on Annamar, and dropped a BTL Y-wing starfighter onto the starfighters docked there, Mase and all the other Rebels were impacted by the resulting blast.
Tom Taylor conceived Mase for the tale titled The Will of Darth Vader, the fourth book in the Star Wars Adventures collection of trade paperbacks. Brian Koschak provided the artwork for Mase within this story.