From the back cover:

ALL IN A DAY'S WORK
Joy and bloodlust coursed through Drascal's body as the Jii seemed to explode an instant before his torpedoes hit. That joy turned to fear as his torps impacted with a fiery sphere of plasma, doing, no damage to the ship within. He opened fire with his Ion Ram and missed. "They have some kind of plaz-screening," he thought, as panic welled up within him. "I can't target through that ..." His thought, ship, and body were shattered as giant shell of plasma erupted out from the enshrouded Jii...

Yoka-Shan Warworld presents the history and growth of the most powerful warrior house in Terran space.
Yoka-Shan Warworld includes:

• 5 Yoka-Shan fighter wings
• 9 scenarios with maps
• A mercenary campaign with six contracts
• A Yoka-Shan time line and history
• Yoka-Shan system listing
• New Yoka-Shan technology systems: -Plasma Shell Cannons
- Plasma Missiles
- Plasma Defense System
• Four new Space Fighters:
-Jii
-Iwisa
-Iklwa
-Kraal
• One new Warhound:
-Cetshwayo
• One refit:
-Death Wind YS