Still own nothing, lol.
To answer a question about thestral mechanics, they would be able to see the Morgana's form because they were in a war and they would have definitely seen death.
'letters and messages'
Morgana rose at nearly ten in the morning, and was immediately startled by the raven perched quietly in her window. She read the missive and decided that it was either a very complex joke, or she wasn't on Earth anymore. She had nearly two hours to the meeting and decided that she had best be prepared for the worst. She broke out a bottle of Firewhiskey to make a good impression on the Nobles. Nobles like booze, right? And if this wasn't Earth, then they'd have nothing near Firewhiskey.
She also wore her armor, it was a warzone after all. Her hair was done nicely (think Tauriel's hairstyle from her Desolation of Smaug character poster) and efficiently. Though she was still amused inordinately by her newest moniker. The Girl-Who-Lived, the Lady-Of-Death, the Woman-Who-Conquered. Now she had a new one, and ironically, she already liked it better. Before she knew it, it was nearly midday. She shifted into her thestral form, grabbed the letter in her teeth, and flew to the edge of the camp.
-SceneBreak-
Pete had seen a lot of things in his 30 years, working mostly as a city guard since he was ten and six. He had seen whores fighting naked in the streets. He'd seen two men so drunk they thought each other women, the morning after that, a fight broke out between the two. There was the flaming dung incident, and not a single person involved thought it was normal. But what he was seeing now takes the cake for strange things.
There was a winged horse carrying a missive from the king. It was unbridled, and walking like it owned the place. Strutting even. Did he mention that the thing was positively skeletal? Not a thin skeletal, just dead looking.
But he had his orders, and gestured to the monstrosity, "Come on, I'm to lead you to the King." The eerie horse followed with frighteningly little leading. It was definitely more than a little creepy.
When Pete saw Evan bow to the horse, he resolved to ask him. When other soldiers also bowed, he was decidedly unnerved. Even more so when the horse-like creature let out a snort that was definitely amusement.
Meanwhile, Morgana was conducting a series of Legilimency scans to find a good way to have a cover story for the nobles she was meeting. Thankfully, she had a good idea by the time that she reached the King's encampment. She wouldn't want to be title-less in front of such men. No good could ever come of being under nobles, in her opinion.
-SceneBreak-
"Ned! Do I look alright? The Lady of the Scythe is going to be here soon!" Robert panicked.
"You look fine," Ned assured, "But you're a married man! You can't bed her if she's a Lady."
"I'll divorce Cersei, the bitch is as cold as ice, and if this one is unmarried I'll take her instead! And if she's no Lady… perhaps she'd be my mistress?"
"And anger the Lannisters? That doesn't seem wise."
"Ned, this woman didn't break a sweat cutting through a battalion of Ironborn! I must have her!" Robert pleaded.
Before Ned could respond, a guard poked his head through the tent flaps and said, "I have your…. Guest? here, shall I allow it through?"
"IT!" "Yes" Robert and Ned said at the same time. Then Ned whispered in Robert's ear, and the King got a look of understanding on his face.
The guard left and the skeletal horse they saw yesterday saunter into the tent. Once no one else was there, it transformed back into a woman. Robert in particular was transfixed by the seemingly black hair with a blood-red sheen to it on the tall and curvy woman. Ned was rightfully impressed with the figure Morgana cut, but he was also fascinated by her armor.
Unsurprisingly, Ned was the first to compose himself, so he asked the million dragon question: "So what may we call you?"
"I am known by Lady Morgana Peverell." The dimension jumper responded, while holding out her right hand, which had the Peverell family ring on in, a black diamond and gold signet, engraved with various runes and the deathly hallows sign, along with a thestral rearing up.
Robert shook his head rapidly, "I've never heard of that house before…"
"You wouldn't have, we were the House that ruled in the shadows in Old Valyria, and since its fall we have been in the Far East, largely in isolation. But now I am the last of my clan, I have decided to come to Westeros. I just happened to show up in the middle of your battle." The emerald-eyed woman cut in. Then she decided to throw in some respect, "King Baratheon."
"Not My King?"
"A Peverell never bows nor bends the knee. Not that many have been foolish enough to try to force one to." The witch chuckles.
"And why is that?" Ned inquires.
"Grab my arm, and we'll go to where I can show you." Morgana says, and the boys obey. She apparates them next to the wall they were putting under siege. "Watch"
Then she hold up her left hand, and murmurs "fiendfyre".
To say that the King and his friend were shocked and awed to see the wall they'd been trying to pierce for weeks melt against this Lady's conjured fire was an understatement. They were outright terrified. They damn near pissed themselves when a chipper voice in an accent they didn't recognize said "And that's just one example, that's just the most… dramatic. Do you want a more subtle demonstration?"
The two luck Lords nodded stupidly. Lady Peverell teleported them to where she saw Ironborn prisoners while she was walking through the encampment. Then she said to the guard on duty for watching the prisoners, "Any of them particularly unpleasant?"
"Yes, My Lady, that one!" The guard exclaimed. Pointing to an unpleasant mess of a bearded man who kept muttering curses under his breath.
"Well, let him up and give him a knife, then let him free. Trust me." Morgana said, feeling particularly malicious. "Imperio" She muttered after the guard obeyed.
The man got a glazed look in his eyes, and obeyed mechanically as Morgana commanded him with malice to castrate himself, then eat his own parts. He choked on his own cock.
Ned nervously asked, "Is there anything I can offer you so that you DON'T do that to me?"
"I second the motion…" The Stag Lord said, just as, if not more nervously.
The dimension jumper got a whimsical look on her face, while she tapped her foot and rubbed her chin. "Well, I do need some land… Just to set up my stuff, but I'd like a house in the capitol too…"
"That can all be arranged, My Lady." The suddenly respectful king responded. Then he asked, "Where would you like the land?"
"I'll just go find some land I like, then we'll figure out the logistics of it, okay?" Morgana asked innocently.
Ned sighed, "I suppose it's for the best."
"I'll see you two back in King's Landing! Bye now." The witch gave them both a hug and a kiss on the cheek, then apparated using vague directions 'a good place for my needs in Westeros'.
-SceneBreak-
"She just got here… She knew nothing of geography… How did she know that King's landing was the capitol?" Robert asked, in a rare moment of mental clarity.
"Is that a piece of parchment stuck to your back, My King?" a soldier asked.
"That it is… Thank you soldier." Ned says. "Robert, it's a message. It says that she knew we would ask this question because she planted a compulsion on you to ask it, and the guard to point on the parchment. Then it says she pulled the information straight from your mind when you were staring into her eyes.
Hey! Were you, a married man, staring into another woman's eyes?"
The King grumbles, "Yes… but they were twinkling. It was a trap?" He offers weakly.
"This is insane. We need to talk to the maesters about this. We need to do something about her. Who could control her as a husband?" Ned grumbles.
Then a piece of parchment appeared over the Winter Lord's face. The writing faced Robert this time, and he read it, "I'll take any man who can defeat me in single combat as a husband. Good luck! This message will turn into fire (no, not the scary, stone-melting fire) when you stop reading this. –Lady Morgana."
Then it burst into flames. A somewhat scorched Ned Stark asked his friend, "How many of these messages do you think there are?" And another appeared out of thin air in front of him. 'Consider it a game… There's lots of them.' Then it turned into a bird and flew off.
"This is actually scary Robert. Do we have any recourse against this woman?"
"My friend, she made a man eat his own cock. Even if we sent armies after her, she'd have them fighting themselves. It can't be tougher to turn men against each other than to make them eat their own balls. The best we can hope for, really, is that she's reasonable and doesn't sabotage anything too important." Robert reasoned.
Another slip of parchment appeared on the King's cheek, 'Very good, Robby. I can call you that, right?' "No, she cannot!"
'Just for that, I've pranked King's Landing'
"She did WHAT!"
'Just wait and see!'
AN: So even in the midst of a war-torn country, Morgana decides that a peaceful existence will be a thin for her, and if she wants to prank the King, that's what she'll do. This story is becoming more of a comedy and less of an anything else even remotely relevant. It should be fun to write, I'll even consider suggestions, but I already know what the first prank is. Till next time! With love, ThatGreyAreaInCompanyPolicy