In the Star Wars: X-Wing novel "Iron Fist" by Michael Stackpole, Zsinj is a powerful and ambitious warlord in the aftermath of the Galactic Civil War. Throughout the story, he seeks to expand his influence and control over the remnants of the Empire.
Ultimately, Zsinj meets his downfall when his flagship, the Guardian, is destroyed by the New Republic forces. This destruction is largely instigated by the cunning tactics of the New Republic pilots, including the protagonist, Corran Horn, and his allies. Zsinj's reliance on overwhelming force and his underestimation of the New Republic's resolve contribute to his defeat. His death marks the collapse of his ambitions and further solidifies the New Republic's efforts to secure peace in the galaxy.
"Iron Fist" serves as a significant point in the X-Wing series, highlighting the challenges and conflicts of a galaxy transitioning from war to a new order.