Spiritual wrath
Author note: Quick reminder of the events in chapters 24-27 in Fields of Gold that led to Khamûl becoming a Nazgûl: Tar-Minyatur is his son by an Númenórean woman called Milce, who was a conwoman claiming to be part of the royal family of Númenór. It was his sexual desire for his half-sister Mara, Khamûl's daughter by his Great Royal Wife, and the resulting murder of nearly the whole royal family which lead to Sauron being able to ensnare Khamûl though one of the nine Rings of Power meant for "mortal men". Mara is the female ancestor of House Martell though her son Morgan and Rhaenys is her current reincarnation. / Rogercat
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All of the now eight remaining Nazgûl could feel when the Witch-King of Angmar, their leader, was slain. It should be impossible for a mortal to slay one of their numbers, but somehow it had happened.
"Watch out right behind you, Faramir!"
Seeing the incoming danger right behind himself, Faramir had enough space to try and twist himself away from Khamûl as the fell beast came so close, but the creature still slammed into him. The closeness to a Ringwraith like this was dangerous, and when turning his head to look over his shoulder, a horrified Boromir saw what danger his little brother was in.
"Get away from my LITTLE BROTHER!"
Sacrificing his last arrow, Faramir managed to shoot it into the face of the fell-beast, before it could grab him between its jaws.
"Faramir!"
The beast and its rider was flying away, but as the Steward of Gondor ran over to his brother where he laid on the street stones, he realized in horror that Faramir had been struck by the feared Black Breath, a produced aura from the Nazgûl, meant to incapacitate foes.
"No…no…please…I can not lose you too, little brother! Not after that none of us got to say our farewells to father!"
Lifting up the unconscious Faramir in his arms to carry his brother towards the Houses of Healing, Boromir screamed at the men around to let him pass.
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With not so many men defending the fleet, something had happened on the flag ship of Robert Baratheon:
"This way, my lord!"
In fact, there were two groups of loyal servants and lesser nobles who had aimed to free Tywin Lannister from his captivity. For them, the King treating his own father-in-law like this, was simply a sign of Robert going mad. After all, his paternal grandmother had been a Targaryen and if it was Mad Aerys getting a last laugh from the grave by making Robert acting unreasonable ever since the drowning of Cersei and the kidnapping of most of the royal children, why else would he be acting like this towards the man who had ensured that Robert could be the King?
"Here, some stray horses to escape with! We should be able to escape long before Robert notices that you are gone!"
But the horses of Rohan, who had lost their original riders in the battle so far, were not so comfortable around those strange men and gave the small group a temporary challenge in getting them to stand still long enough to be mounted.
"Come on, we need to hurry!"
And then the same strange, frightening cries as from the kidnapping of Tywin's grandchildren, was being heard above their heads.
"Oh, no…"
It was no one else than Khamûl, who blocked their path to freedom with his fell-beast landing on the ground.
"And where do you think that you are going, Lion Lord?"
Despite trying to not show himself as being afraid in front of those men who had freed him from the chains, something in the usual intimidating gaze which Tywin was infamous for, seemed to not really work as normal. Perhaps it was because he remembered Khamûl beating him back black and blue across all his body in King's Landing, like he was a commoner being punished for some crime. Or simply more likely that Khamûl was a wraith, and therefore had no reason to fear whatever threats that Tywin normally would use on the fellow mortal enemies of House Lannister.
"Move out of my way."
But Khamûl only laughed in mockery at how Tywin failed to make the command sound threatening, the cold voice that normally would make people in Westeros fearful.
"Think that you can command me, one of the Ringwraiths serving the Dark Lord Sauron? Me, who once was a King over my own realm? Perhaps you need another beating to break your pride, Lion Lord!"
The deadly flail of steel and iron was raised in his hand, and the Rohirric horses did the sensitive thing as prey animals: rearing so the unfamiliar riders fell out of the saddles, and then galloped away from the danger.
"Not to ruin your fun, Master, but this Lion Lord really deserves to be beaten for more than just trying to murder the reborn Princess Mara and her family."
It was Visenya who showed up in a minor portal, using a black-haired wig to hide her actual hair that would reveal her as a Targaryen blood relative, the wig also masking her eyes somewhat.
"What?" Khamûl wondered in a low, dangerous voice, his eyes focusing on his currently youngest, mortal Consort. Visenya did not respond, but instead made a hand wave towards Tywin and her magic struck him.
"You little…?!"
But it was not the Lord of Casterly Rock standing right there as Visenya forced his soul to reveal itself bare, but a completely different person who had been so contrasting in character from Tywin that no one had imagined a possible connection between them.
"Good job in hiding your original self though a circle of endless death and rebirth over time, traitor and destroyer of Kemet," Visenya smirked, seeing how Khamûl was overtaken by the memories so long ago when seeing who Tywin had been in a past life, and his anger literally exploring at this reveal that she just had used her ability to see the past, in order to show it to her Master.
"TAR-MINYATUR!"
The men threw themselves in front of Tywin in order to protect him from the furious attacker as Khamûl used his magic to transform sand into a deadly mace, only to be caught between the jaws of the fell-beast or struck by the Black Breath from Khamûl.
"Lord Tywin, run! Run, run!"
"Run for your life!"
And with all his courage and normal self control gone, this was exactly what Tywin did. Perhaps something finally clicked in his mind that this was an enemy he could not defeat by any threats or actions as the Lord of Casterly Rock, and that he was in true danger of death.
"Do not kill him yet, Master. Mara's current mother deserves to get some revenge on him too for trying to have her and her children murdered on his orders. But I think you can tenderize him up nicely for Queen Elia Martell of Rohan before it will be her turn to take revenge."
With Visenya creating a minor barrier around the portal, there was no one left to protect Tywin from the wrath of the Ringwrath who had been his father in his first life.
Unfortunately Tywin did not get far, before he felt a hand dressed in a gauntlet on the back of his shaved head and Khamûl slammed the mortal face first into the hard ground.
"Agh!"
But the Nazgûl had only started in torturing the man who had aimed to kill Mara in her current life back when she was a very young child. Raising the mace over his head, Khamûl growled like a wild animal:
"I will make you wish for death, Lion Lord, and deny you it!"
Tywin screamed in pain as Khamûl crossed his hands with the mace, and then the same to his feet so he would not be able to run or even walk properly.
"That tongue who ordered her murder…you will have no futher need of it!"
Punching Tywin in the mouth several times, it was both blood and teeth that came out after each hit. Then, taking out a steel dagger from his belt, Khamûl proved his threat real by forcing Tywin's jaw open and then cutting off his tongue in one single move.
"Oh dear, can not have him bleed to death yet. Let me heal that, Master."
Having grown up around Khamûl since being more or less a newborn baby, Visenya showed no major shock at seeing how brutal her Master could be when beating someone up. After all, she had found out that Tywin was the current reincarnation of someone who had ruined his life so long ago in the Second Age.
"I think I know the perfect way of breaking your self-image in this life, Tar-Minyatur."
Khamûl used his mace to more or less literally crush Tywin's groin area, nearly causing the former Lord Lannister to faint from the massive pain, and then the dagger to castrate him, removing both balls and cock from Tywin, who could only show his pain by the horrified look on his face. Given how much pride Tywin took in being an able bodied man of Westeros, becoming a eunuch like this would indeed crush his self-image.
"You are really giving me a lot of healing to do on someone you want to remain alive for as long as possible, Master," Visenya commented in a bored voice as she once again had to prevent Tywin from dying from massive blood loss or internal damages, the closest thing to a complaint that she ever did in his presence. Healing magic was not her strongest ability, and it was not helped by Khamûl being a servant of darkness. Not that her Master would care for such details right now in his fury, as long as Tywin remained alive on his order.
"Mara and her current family shall have to wait with the gift of punishment that they will give him with time. I have no intention to let this Lion Lord die yet, either now or later from the injuries that I have just given him…especially given who he once was in the past."
Glaring at Tywin where he now had fallen unconscious from the pain, Visenya promised herself to enjoy how he, the mighty Lord Lannister, had fallen so low. Yes, Elia Martell would not learn about this yet, but she sure was going to feel some pleasure at how Khamûl would break Tywin until he was a shadow of his former self.
"Have a nice taste of your own medicine by how your lack of forethought and callousness feels like, Tywin Lannister."
With her ability to see the past, Visenya knew how much of a control freak Tywin Lannister was. If he had believed it bad to be a prisoner of Robert Baratheon, and stripped of everything that House Lannister had symbolized for so long, well, he was going to find it far more of a living nightmare under the "care" of Khamûl and any orcs ordered to handle him in Minas Morgul.
"Get back to the Temple, girl."
Bowing her head at the command, Visenya obeyed and closed the portal. But despite how the Battle of the Pelennor Fields ended in a crushing defeat for the armies of Mordor and their allies, the capture of Tywin Lannister was a personal victory for Khamûl.
"Ha, ha….finally, finally I have found your current self! You are going to taste my full wrath over your murder of my wives and other children, Tar-Minyatur! You are going to truly regret causing the fall of Kemet, all because you wanted to avenge the sea-woman who birthed you and refused to admit that you were my most unlikely choice as successor on the throne! And since you tried to have Mara murdered in her new life…you are going to regret that as well."
Trapping Tywin inside a sand coffin sans for the face, Khamûl made his fell-beast carrying the prisoner inside its claws as the ringwraith left the battlefield at noticing how the armies from Mordor were losing.
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Author note: Tywin being the current reincarnation of Tar-Minyatur was a plot twist I realized to work far better than Rhaegar in the role. Not only would Tywin be far more unexpected, but it would give a extra layer of depth to his in-story obsession with finding Elia and her children to really have them killed for real since that mission failed at the Sack of King's Landing thanks to Théodred showing up, because he truly views the survival of Rhaenys and Aegon as a massive threat to his Baratheon-Lannister grandchildren as the new royal dynasty of Westeros. Basically when Aria brought Elia and Oberyn to Casterly Rock after the death of Johanna, a part of his soul believed Elia to be the reborn Mara due to them sharing a striking similar appearance despite the amount of generations between them, and her getting married to Rhaegar instead of Cersei triggered a desire to see Elia dead
