Twilight, lying on her back, stared up at Rainbow Dash. "This is a dream, isn't it?"
"Yep." The pegasus gave a nod. "In case the multiple instances of Celestia's detached head didn't give that away." She gave a look around the red lake, and at the heads floating in it.
Twilight just shrugged, still floating on the surface of the lake.
"No, seriously, is it something you ate? I don't think dreaming of this kind of thing is normal." Rainbow looked back to Twilight.
Twilight shrugged again. "It must have been something I read."
Rainbow was silent for a moment. "Okay then. I guess this doesn't really count as a nightmare, so I should probably leave. Leave you to your weird existential dread and symbology."
Looking at the purple sky above them, Twilight asked, "Will I remember this?"
"Figuring out it was a dream?" Rainbow began to walk away. "Nah. You'll remember me being here with my armour, but it'll register as part of the dream. You'll forget the contents of the conversation."
Twilight took a breath. "You didn't tell me you'd picked up dreamwalking."
"And I don't plan to until I have to," came Rainbow's distant reply.
Then the pegasus was gone, and the green star shining in the sky disappeared behind the mountains of bones on the horizon. Red holes dotted the orange canvas of the alien night sky, and screams echoed from beyond them. And Twilight's body floated on, occasionally bumping against one of Celestia's heads, as the current lazily brought her towards the gate.