Second Duel on the Unseen Queen

The second duel on the Unseen Queen was a aboard the Imperium flagship Unseen Queen in 157 ABY which spelled the Imperium's doom.

A fatal mercy
Eskol Kaartinen, a Centurion of the Order of Keltrayu,, and of the Imperium Nest of Nests, had led the Imperium to victory during the Second Swarm War, united the disparate  nests, and defeated his comrade Te`net Organi when the Qua sought to prevent Kaartinen from unleashing the united nests against the known galaxy on behalf of the Golden Empire. His Killik workers doubled their efforts to complete the Unseen Queen and ready a motley fleet of ships for deployment.

The crippled Organi had been imprisoned aboard the Unseen Queen, brooding over his failure to defeat Kaartinen and forced to care for himself telekinetically except when Killiks were sent in to assist him. However, he carefully kept the stumps of his wrists concealed, correctly intuiting that Kaartinen had either forgotten or never known that Qua could regenerate lost limbs. He bided his time until the fleet was nearly ready for deployment and his hands were regrown, then his guards so he could escape his cell.

Fratricide
Racing to the Unseen Queen's bridge at, knowing the game would be up if any Killiks spotted him, Organi burst onto the scene and managed to retrieve his lightsaber in the brief moment in which Kaartinen and Chindal were too stunned by his appearance to react. The diplomatic Chindal attempted to get Te`net to surrender, but the Qua did not allow himself to respond; hesitation had cost him victory in his first attempted to defeat Kaartinen, and so he had spent his incarceration mentally steeling himself for the battle.

At Kaartinen's direction, Chindal and his guards swarmed Te`net along with Kaartinen himself. Te`net killed two of the Rekker quickly, putting the other large insectoids between himself and Kaartinen when possible as he fended off the other guards and his brother. Resolved to the need to be merciless, he caught the much less adept Chindal from the side, removing the Dronos's right leg and right arm in one blow. As Chindal went into shock, Organi quickly dispatched the other Rekker and came together with Kaartinen again.

Despite being a Joiner, Kaartinen had lost none of his formidable lightsaber skill or mastery of, but Te`net had planned for this as well. When his first sallies against Kaartinen's defense failed, Te`net instead deployed his blade on the bridge control stations and the Killiks working them. Joined together in the hive mind, Kaartinen could feel the death and fear among the Killiks in his nest, and the damage to the controls, if left unchecked, could render the Unseen Queen unusable. As a result, the Vuul was forced onto the offensive, chasing after Te`net and bringing the attack to the Qua.

When Kaartinen attempted to fall back on defense, Organi resumed his strategy of diversionary destruction and killing. Frustrated, Kaartinen attacked with more ferocity, finally overextending on a power stroke. Using to slip past Kaartinen's guard, Te`net reactivated his blade from the side, piercing Kaartinen's heart and lungs in a single blow. Kaartinen died shortly thereafter.

Aftermath
Kaartinen's death and Chindal's incapacity threw the Imperium's hive mind into chaos. Organi orchestrated the Massacre at Murgo to demolish the Imperium's war machine, sabotaged the Unseen Queen's reactor so it would explode from the inside, and escaped back to the Golden Empire with Chindal and Kaartinen's body.