When using dimension step, you feel a strange pulling sensation and when you appear in real space, the room is dark and empty. You see ashy remains covering the floor that look like snakes. You also notice two larger piles of ash that look suspiciously like humanoids.
You notice all this and then the world dims and goes black as something thumps you on the head.
“I’ve been waiting for you, Tully. Don’t worry, the end of the world isn’t so bad the first time.”