Let’s combine all of the ideas put forward so far:
“Rey… wherever you are… you are hard to find.”
“You are hard to get rid of.”
“I pushed you in the desert because I needed to see it… I needed you to see it… who you are. Darkness is in your blood, Rey…”
“You’re lying.”
“I’d never lie to you… your parents were junk traders, bartering Star Destroyer parts for favor within the Sith fleet…”
“Don’t!”
“Ascending the ranks of the cult, they were honored with raising you."
“I don’t want this!”
“You grew unnecessary."
“No!”
“Palpatine ordered your death, but they’d grown to care for you.”
(Rey sees the vision of her parents and her abandonment.)
“Rey, my love… be brave.”
“You’ll be safe here… I promise.”
“Come back! Nooo!”
“They paid for your protection… in more than one way.”
“Stop talking.”
“Rey… I learned what happened to them.”
(Cutaway to heroes capture)
“Your parents sought Luke’s protection, chasing rumors of a congregation in the Jakku desert… but Ochi tracked down the ship he’d gifted them. They resisted fiercely, only to be forgotten by the sands of time."
(Rey sees her parents get killed.)
“So that’s where you are.”
“You know why the Emperor’s always wanted you dead. I’ll come tell you.”
“Why did the Emperor come for me? Why did he want to kill a child? Tell me.”
“Because after his full return, he saw his experiments as threats to his rule. You were designed from the blood of the Emperor. You… are a Palpatine.”
“The only purpose for your creation was to be one of his hosts on the Sith throne. But what Palpatine cannot foresee is that we’ve become a Dyad in the Force, Rey… two, linked by raw power. We can end him and the Sith, and create something new, together…”
(Removes his helmet)
“You know what you need to do. You know.”
“I do.”