A/N: Wow. Done already. Cool. Next chapter should be out in couple of days, since I am temporarily stopping my Star Wars story to finish this one. (Only two more chapters to go now!!!!) Nothing much more to tell you for this chapter, so I'll just say thanks for reading and let you do just that. Thanks for reading!

Disclaimer: I do not own Twilight and or any of the characters that appear in the Stephanie Meyer books. However, the characters that do not appear in the books are of my own creation.

Vow of a Broken Heart

Aro saw the fear and disbelief on Vladimir's stricken face as he returned to the fighting, so he knew things had gone smoothly in his short absence. Aro did a quick headcount. There were but twenty-one left under Aro's command, not including him, and the Romanians were down to ten, not including Vladimir and Stefan. He glanced to see how Marcus and Caius were faring and smiled; they had ten, plus Marcus and Caius, although Trevor was nowhere to be seen. Sonia's guard had been obliterated, and Sonia along with it, presumably. Lucian's fifteen remaining, not including him, were putting up a good fight, but Marcus' vampires were soon going to claim victory.

*

Trevor needed all his strength and concentration to keep Sonia's body parts from reattaching themselves, so it took him several minutes to get back to the main battle. When he returned he dropped the body parts on the top of the hill, kicking them away from each other. He yelled to Marcus for help and all the vampires paused to see Trevor and a scattered Sonia's arrival. This was the real turning point, as Lucian cried out in rage for a few milliseconds as he fought, unsuccessfully, through the Volturi to save his mate.

"It is done then." Trevor said as Sonia was destroyed. "It's over for now. We will kill the others, and the threat of the Romanians will be gone. Aro and Caius will rise to power, while Didyme, you and I spend millennia or two in this isolated land you tell me about." Marcus smiled and rushed off to finish the job of winning the battle.

But when Marcus turned around, the Volturi were chasing Lucian and his guard in vain. They had escaped in the confusion and chaos of Sonia's death. Marcus immediately turned to see Aro's side of the battle, and it was over. The Romanians were all dead and Aro was howling in rage. Confused Marcus ran over to him, Trevor close behind.

"What's wrong Aro? The few Romanians who escaped are not enough to challenge the Volturi now. Trevor and I will personally hunt them down if it appeases you." Marcus said, slightly disappointed that Lucian and a few of his guard had escaped, but confident that his words were correct.

"Today we have taken over 40 Romanian vampires, including Sonia, one of their leaders. But it has come at too great a price. We lost Vladimir and Stefan also. They fled in the chaos of Sonia's death, and joined with Lucian and his guard," Aro said. Marcus shrugged.

"They can be killed just as easily as Sonia when Trevor and I face them."

"I do not refer to that." Aro said, hanging his head with fake yet well simulated shame and sadness.

"I know, Aro. We also lost over 40 of the Volturi." Marcus said grimly. "They will be difficult to replace, and you must keep the Volturi sharp and cautious until numbers grow again."

"I do not refer to that either, Marcus, but to Lucian's most brutal and cruel act of malice and hate yet." Aro said. Marcus frowned.

"Where is Didyme?" he said, his voice trembling as the penny dropped. Aro said nothing for a few seconds, and there was silence. All the remaining Volturi were assembled, and the shock of what had happened hit them.

"I... Aro... How has this happened under your protection? How did Lucian leave the front of the battle without my detection?"

"The two fronts were a mile or so apart, so he could not deal the final blow himself. One from Stefan's guard did that. I killed him, tore him apart with my own hands!" Aro seemed to break down here. He took a deep, dramatic breath and continued. "I threw him into the fire, but the one who really killed Didyme is still out there! Marcus, revenge can only be taken out properly on him!" Aro said no more and Marcus nodded. Trevor had stood shocked, unable to speak throughout the whole exchange. Didyme had been like a mother to him, and he could only imagine the pain Marcus was going through now.

Marcus left faster than Trevor could react, but quickly followed. Mathias hung his head and silently prayed that Didyme's soul reached heaven, as she had always been a strong Catholic, even though Aro, her brother, had abandoned the Christian faith two centuries ago. Mathias himself had never been Catholic, or even Christian, but he felt compelled to ask someone for help, even if it was another vampire's God that he didn't believe in. He put his arm around Farfalla's shoulders, and all remained silent as the Volturi mourned the dead.

Mathias kissed Farfalla on the cheek and she leant her head on his shoulder. Mathias noticed other couples comforting each other, but most walked away to mourn their friends and mates who had perished in the battle. Aro left soon, and Mathias could not hear him, but he saw Aro talking to Chelsea with a worried look on his face. Convincing her to cement Marcus' loyalty to the Volturi using her power, thought Mathias with disgust. Aro's sister had just been murdered and it seemed that he had already finished mourning. He couldn't know that Aro had been the killer.

Marcus pummelled his fists into the ground. He screamed to the sky.

"Curse this God Didyme had! How could a kind god take her away?! My Didyme..." He was still thumping punches into the earth, and making large dents. His anger slowly changed to sadness and his punches slowed down until they stopped altogether as Marcus let himself fall to the ground. Marcus wanted nothing more than to chase after Lucian and die trying to take them all down. He would be with Didyme, whether in heaven or hell, and that was all that mattered to him.

"Swear on our love..." Marcus mumbled, although Trevor could still easily hear him.

"I don't understand, Master." Trevor said carefully. He didn't want to enrage Marcus on the day of Didyme's death.

"She made me swear on our love that if either of us were to die, the other could not try to follow, else our bond as mates would be meaningless, if we couldn't keep a promise such as that." Marcus said. He was truly broken.

Marcus didn't try to follow Didyme. But he made a vow that would ultimately finish the conflict between the Volturi and the Romanians.

"I swear on my love for Didyme, my wife and mate, that I will see Lucian dead, or at least orchestrate his death, but not try to follow Didyme to heaven." Marcus said, the sadness gone from his voice, although that would be forever in his heart.

He stood up, his mind thirsting for only one thing: revenge. Trevor stood by his master's side, master and servant, father and son, leader and follower, the two most dangerous vampires the planet had seen. They silently returned to Volterra.