Tara, of course, couldn't help but brag a little.
"I never said he was dead, did I?"
It had been a tricky plan-- distract him long enough to move him into position by the throne, pull Aithreachas from his control if only for a moment, and hopefully overpower his control of Seelie with their combined forces long enough to land a blow on him. He'd nearly leapt in anyways with his own borrowed sword, one pilfered from the armory minutes before, the few times it seemed Iain was close to hurting Tara, and he himself had not managed to strike the fatal blow they had hoped possible. And of course, his wounds were reopened and bleeding once more. But they managed to deal a great blow, and hopefully they could manage to see things through without getting themselves killed.
Enraged, Iain roared and charged, and the siblings leapt into action. The two fought the man together, each covering the other's slips and mistakes. The ground rumbled as Iain pulled parts of the room itself asunder in his rage. Chunks of earth torn from the ground and launched at them, bits of the ceiling ripped apart and launched like wooden spears, it took everything simply to dodge the assault or redirect the materials just enough to miss him and Tara. His sister kept up best she could but without the land's blessing, all she could do was dodge the land thrown at her and hope her brother could handle the rest for her.
But Tara was already exhausted from her earlier bout, and Camhlaidh himself was still clearly weakened by his injuries. The lost arm slowed Iain, but the man still moved fueled by his rage and spite. It would have almost been admirable to Camhlaidh, if it weren't such a nuisance.
Once again the battle lay precariously balanced, with the slightest shift risking it falling one way or the other.
That shift came when a piece of stone caught Tara unawares, and the princess was sent crashing to the ground in a painful heap. Iain's sword soon followed, and the princess braced herself, yet again, for the impact.
Instead, her brother's weight rocked into her, and Tara opened her eyes to find the tip of Aithreachas only inches away from her, protruding from her brother's back before her. The sword had been run through her brother's chest, and Tara's breath froze in her throat. Above them, Iain's similarly surprised expression morphed into one of twisted glee, and with a quick movement the sword was drawn from Camhlaidh's chest and cleaved through her brother's arm, pulling a ragged gasp from him. Tara's shock stilled her, but her brother's noise of pain jolted her into action. Iain was too busy admiring his small bit of retribution, the arm lined with pale green marking laying on the ground, that he didn't notice Tara's sword until it pierced his shoulder. The man attempted to recoil, but it was too late-- the attack held him in place as Camhlaidh finally drove his sword through Iain's chest, straight through the fae's heart.
Unbelieving eyes stared down at Camhlaidh's face, pale yet resolute, and Iain staggered backwards when the siblings pulled their blades free from his body. Silver blood poured from the man's wounds, and he attempted to use his sole hand as if to stem the flow.
"Y-you...! He took everything from me! Everything! I..." The strength left Iain's body, and the man sank to the floor as his blood soaked the earth of Seelie yet again. "My brother..."
The king forced himself to his feet, and Tara watched Iain silently from the floor. Camhlaidh's gaze was pitying.
"My apologies cannot cover the scope of what you lost-- what was taken from you-- and those who gained from it. We all exist now because of you, and I will do what I can to make the story, in its entire, awful truth, known throughout the land. Return to the earth, and...may you be at peace, my ancestor."
Iain's uncomprehending expression remained until the light left his eyes and his expression slackened. The man's body began to turn, plants and grass growing from its mass. He was gone.
And with that, Camhlaidh himself finally collapsed to the floor, unconscious amidst Tara's increasingly worried cries for the physician.