(Third Person POV)
Rhaegon was atop Morghul, flying over the battlefield, or what remained of it. He had taken the fight to the Dothraki Horde, casually demolishing them with several sweeps, burning them all to the ground.
He circled the surrounding area, checking to see if there were any incoming waves, but saw that there was none. His sudden appearance had greatly helped the Dornish forces that the Dothraki was crushing. Within minutes, Morghul easily switched the tides of the battle, the horse savages being incinerated easily.
Rhaegon had received word of the sudden invasion and decided to fly to war. He had left Nymeria and Tyene back at Summerhall, to keep Myrcella safe and had taken Obara with him, who insisted on joining him.
On the way down, Rhaegon came across an envoy that was escorting Princess Arianne Martell, Obara's cousin. She was being escorted by House Dayne and Rhaegon told Obara to stick with her just in case something happened. He had then heard that Sandstone was being sacked by hordes of Dothraki and decided to fly over to end the battle.
And that, he did.
Rhaegon looked over to the distance, feeling the intense heat of the sun, "Tch..." He said with a frown, "I forgot how hot this place is....but then again, the flames are adding to it."
He looked down to see nothing but flames and smoke in the middle of the fields, what remained of the Dothraki. He saw the dornishmen recovering, backing up from the leveled battlefield.
"I'll patrol the perimeter, make sure there's none anywhere else." He said as he steered Morghul to the left, "This is absurd, a sudden invasion.....well, it's not like we didn't anticipate it. But the timing is off....what could have set it off?"
Morghul let out a roar as he flew a bit south, picking up speed as Rhaegon leaned forward.
From below, the dornishmen watched this in relief; the sight of Morghul putting them all at ease. Suddenly, they found themselves grateful that Oberyn's daughters were his paramours, if not, this wouldn't have happened.
Several minutes later, Rhaegon was further down south. He could see nothing but sand below him, deciding that there was no Dothraki horde nearby.
He looked to his left, thinking there could be more towards Hellholt. And that was the case, there was a current ongoing battle between the Dothraki and House Uller.
"Let's go..." He muttered as he steered Morghul towards the left and decided to head to that direction
In a matter of minutes, Rhaegon had quickly wrapped up a fierce battle between House Qorgyle and the Dothraki, giving them a chance to recover and rally their remaining troops to take them wherever they needed to.
Now, Rhaegon moved towards the east, in search of more Dothraki to destroy.
*************
[Lemonwood]
Khal Daegon sat atop Drogon as the black dragon crawled atop the sand, letting out a roar that resounded through the battlefield.
"Burn everything down." He said in Dothraki, "We move further North and turn the Sands red with Dornish blood!! He pillage and destroy any village or town that we come across and destroy everyone that stands in our way!!"
In front of him, Lemonwood was set ablaze in the distance, the war cries of the Dothraki were heard. His men were riding around in their horses, finishing off any remaining Martell and Dalt men.
In front of him, two Dothraki were pulling what looked like some sort of wooden platform with their horses. On the platform, a massive wooden stake was erected, Oberyn Martell was tied to it, his entire face and head covered in blood.
Daegon raised his arakh, standing on the saddle as he let out a war cry, which his men heard and returned in kind.
Behind Drogon, more Dothraki riders appeared, the chilling sound of the Dothraki war cry could be able to be heard for miles, followed by the thundering stampede of their horses.
On this day, Oberyn Martell was defeated by Khal Daegon and Lemonwood fell to the Dothraki.
Drogon raised his head upwards and let out a vicious roar, the sound of the dragon filled the air, shaking anyone that remained to their core.
"What will your brethren think, Martell?" Daegon said as Drogon approached Oberyn who was tied to the stake, "To be defeated so pathetically?"
Daegon had defeated Oberyn after the latter did not wish to hit the Khal with the bladed edge of his spear as it was coated in poison. This was due to the fact that Oberyn was convinced that Daegon was his nephew, Aegon Targaryen.
And while that may be true, Daegon did not realize this nor did he care. To him, his parents were Drogo and Meleys, one who was dead and the other not present.
"Valerion....." Daegon said aloud, "My riders will set upon the realm and destroy everything....and if you get in my way, I'll kill you too...."
He sat back down and looked at the riders pulling Oberyn's platform, "Take him to the camp." He said in Dothraki, "I will fly to the nearby city and raze it to the ground."
The riders nodded without saying anything as Daegon strapped himself to the saddle and Drogon began to stand up and flap his wings.
As he took flight, Drogon let out a roar, announcing his presence to everyone.
Everyone watched as the massive black dragon took to the skies, casting a shadow. It was a terrifying sight, the black dragon that was on the Dothraki's side.
If nothing was to be done, this could spell the end of Dorne.
***********
[Summerhall]
"Uncle!" Myrcella said as Viserys dismounted Moonfyre, "What are you doing?"
"Have you heard?" Viserys said as he walked over to her, "Dorne has been invaded."
They were outside Summerhall, Myrcella had Nymeria and Tyene behind her as the Prince approached.
"Y-Yes...." Myrcella said, "Rhaegon left already."
Viserys nodded, "Right...." He said, "I don't have a good feeling about this...."
"What do you mean?" Myrcella asked
Viserys looked around, as if he was thinking about something for a few seconds, "I'm going to go there." He said suddenly, "To Dorne. I'm going to aid Rhaegon."
"What?" Myrcella said, "Are you sure?"
Viserys nodded, "Yes. Not before taking you to King's Landing, however." He said seriously, "I don't trust that you are by yourself here."
"I'm not." Myrcella said, "I have Nymeria and Tyene."
"It doesn't matter." Viserys said, "Come, let's go. All three of you. I think Moonfyre can hold you all."
"But..." Myrcella said
"I have spoken." Viserys said as he turned around, "Let's go!"
"Is this a good idea, Princess?" Nymeria asked her
"I don't know..." She said, "If this place is attacked...we won't be here...but Rhea will..."
"I don't know about this..." Tyene said
"I'll go with the Princess, Tyene." Nymeria said, "Stay here with Rhea."
"Are you certain?" Tyene asked, "We'd all be separated."
"It's better for one of us to stay with Rhaegon's sister than leave her alone." Nymeria said, "If this place is attacked all of the sudden, she'd be safe."
Tyene sighed, "I suppose so."
"Hey!!" Viserys called, "Hurry up, I do not have all day!!"
Myrcella grabbed Tyene's hands, "Be careful." she said with a smile, "Okay? I have to go. My uncle means well."
Tyene nodded, "Right."
"Let's go." Myrcella said to Nymeria,
"To King's Landing."