For over a decade, Jun Seros served as a Knight of the Jedi Order, mastering the arts of warfare and lightsaber combat without ever striking a blow with intent to harm. That ended when the Sith Empire returned; understanding the fight ahead, Jun Seros took up his weapon in earnest for the first time in his life. Unlike many of his Jedi peers, he did not shy away from war.
Jun acted as a general in the Republic's armed forces and trained dozens of Jedi as the order's Battlemaster. His strategic genius and bold personal interventions left him undefeated on every front he led. When Coruscant was sacked, he was vocally opposed to honoring the treaty that followed‒a treaty he continued to warn against trusting for years.