They'd done a remarkably good job of that, given that since he joined the First Order, he hadn't set foot on that world. But he tried to think back before that time, even though it was hard.

"I think... I kind of remember big trees. Really, really big trees. And being determined to run around one that seemed to go on forever... Or maybe that was just a dream."

He had a few faint memories of Chewbacca too - holding him when he cried, rescuing him when he was scared - all things the Supreme Leader tore to pieces and buried deep down. (With the same techniques that Kylo Ren became so proficient with, no less.)

The rathtar skewer dropped onto the table as he gripped his head in both hands. "...I just... I can't remember..."