|This article is about the Chapter Master of the White Scars, for the Luna Wolves Sergeant see Xavyer Jubal|
Jubal was made Chapter Master after he successfully survived the trials set by the Stormseers. He, and three others, gathered at the Khum Karta mountains, within the Valley of Khans, and only Jubal emerged. What the trials are remains a mystery as none who survive them ever speak about that time.
During his time, Jubal has fought countless aliens and battles. One of his greatest achievements was during the Jopal Uprising. He led the First Brotherhood in several raids and strikes against the enemy supply and communication lines. Such was the devastation that the enemy were forced to divert large numbers of troops to deal with the White Scars, but this allowed the Imperial Guard to batter through the weakened front lines and end the insurrection.
Currently, Jubal is engaged in the 3rd Armageddon War, where the White Scars operate both on Armageddon and on the surrounding Ork held worlds. They have been successful at disrupting the Orks and holding back assaults, allowing Imperial garrisons to prepare, while on Armageddon they were assigned the Deadlands where, in one instance, they destroyed an entire Ork brigade without taking any losses or firing a single shot, presumably through isolating the Orks from their supplies and reinforcements.