Princess Luna didn´t mind the Moment of silence after her warning to him, it meant she had found something he knew no comeback to, she wished she had been right in that when the reply came.
It wasn´t his voice speaking anymore, not entirely, his wings crackled with the power he normally commanded as it detached from him, a Pegasus shape made of pure electricity walked up to her and snarled in the warped Version of his voice.
"Heh, you are right, there is an inner demon in him, he doesn´t know of me of course, I am his resentment incarnate, you should know about the likes of me very well, Luna, remember our good times?"
"Nightmare?"
"that´s what you called yours, princess of dreams, i am thunderstorm, born from betrayal, like all of us."
The dreamscape shifted again showing a bipedal figure kneeling before a statue and beating against it.
"betrayal, big or small creates resentment, a former Student of your dear sister, disgraced and trapped in another world for her curiosity."
Sure enough a demon Version of the creature became visible, seemingly planning to raise an army and conquer equestria.
"and our Goal is always the same, to make the one that wronged us pay."
Luna could see now that between the electro Pegasus, the demonic alicorn many more warped figures had joined, in different states of being posessed by their desire for vengeance they all stood, surrounding the princess of the sun.
"she has made so many mistakes but clings to claiming that only she could Keep peace, if that peace creates us, maybe it´s a bad peace?"
She saw once more Thunderhead´s memories, the one of him being ripped from his sister´s arms, dragged to cloud haven, put in shackles and thrown in a cell, a whole night spent crying for his parents to come save him, until finally an older stallion picked him up and put him in the bunk bed, telling him to rest up. this time however she heard the spoken words of the Little colt.
"Why do they do that?"
"because they don´t like what we are."
"what?"
"our wings, our strength, they don´t care if we´re bad ponies when we´re stronger than they approve of."
"that isn´t fair!"
She was ripped out of the Memory.
"I didn´t have a happy birthday, but since then i´ve grown, and how couldn´t I ? He never had anything better to do than look up all injustice in the world, for ten years he researched, connected dots and drew the Picture of what celestia is really like, a feast, i tell you."
"he doesn´t see her for what she is trying to do. she didn´t mean to hurt so many."
"but she did, and that´s what matters, his mind is a torn up place, there´s me as his vengeance, the Little colt as his identity, and the grown leader of the rebels as his self. and with every undeserved strike of fate he suffers the other two grow closer to releasing me. that´s when the mitts come off, that´s when i will hunt you and all of canterlot down.
You want nightmares? wake up then, you have entered one that Celestia made."