Dream and Balthazar
"The last person to trap me died before I was freed, but I did punished his son by giving him eternal wakening." So yes, if there was someone behind all this, Dream wouldn't be too happy with them. But he was pretty sure that what was behind the dome was the dome itself. And he wasn't sure how he'd punish a dome or even if he could.
"Perhaps, perhaps not. Who knows. If it does, it won't be any time soon." He finished off his glass of wine. "Well, I think I'm going to get going. Have a good rest of your evening," he nodded to the angel before disappearing.