darkness.
"My name is Xemnas, I run this organization."
"Ah, you're the one who hands out the numbers. Or did you draw them?" Asked Raven.
"It's not that important.", He waved him off quickly as Xemnas continued to look at him.
Xemnas pulled him back on his feet: "You will need a new name. Your old name no longer has any meaning."
Raven quickly withdrew his hand. The thought of suddenly having a different name worried him.
"From today you are Nox. Nox, the quiet death."
Raven made a face. That didn't sound very friendly, but if it was the only way to find out about yourself."Okay!", Raven nodded.

So Xemnas took the only thing left from the boy: his name.