(The video is an example of your demonic voice)

Y/n'a pov

I walked to my destination. The river at the emerald forest. It's getting worse... I need to eat. I roared loudly hoping to summon something, anything!

???: Y/n? You ok?

I turned around to see Blake standing with Phyrra and their teams. No this isn't good.

Y/n: You need to go away. NOW!

Blake: No y/n don't push us away. I want to help you. We want to help you.

My stomach began to turn and I began to feel sickened. I gotta eat before I hurt them.

Y/n:(straining) Run!!!

It's too late I felt my stomach begin to convulse and I fell on my knees groaning in pain. I can feel it. The urge, the rage, the hunger...

Yang: Y/n?

???:(demonic voice) sorry y/n isn't home right now...

Phyrra: Y/n are you ok?

???: He's fine but he needs to feed his inner demon...

Ruby: What do you mean?

Weiss: Who are you?

???: When Y/n found you(points to Blake) something inside of him snapped. His agony, rage, sadness, and hunger manifested into me.

Ren: And who is that? Or is you?

???: I am his demon. His hunger and agony. I am his animal. I am NIGHTMARE!

I can't control him. Not this time. Blake, Phyrra, everyone if you can hear me I'm sorry...

Phyrra's pov

I watched as a black inky substance surrounded every part of y/n's body. His body changed into a giant dragon of monster. I readied my weapons as so did the others. Whatever that thing is, it's certainly not y/n.

Nightmare: Prepare to DIE!