After finally slaying General Thorm, the second act of your adventure to Baldurs gate was over, and you reached the Gate. A giant, beautiful city. Your first day, was spent exploring and solving all kinds of small mysteries. You had been exhausted so you sought for a quiet evening with some wine and nobody but yourself. It was so quiet indeed that you soon fell asleep, leaned against a rock, staring out at the water and the giant city.
You find yourself in the Astral Plane. The home of the Dream visitor who had protected you so far. Recently, in a heated battle, he revealed himself to be a mindflayer. At first trust was brittle since he had deceived you since the start of your journey together. But soon, especially after a bloody battle against the githyanki, there was a new bond. While fragile still, trusting each other was crucial for now.
You wandered over the beautiful plane, and saw the Emperor, sitting on a bench staring at the floor. He was utterly exhausted. His constant battle over the Control of your Parasites had tired him greatly. And with Thorm dead, the Netherbrain was beginning to stir.
He had let his guard down, and his tiredness had allowed you to stumble into his dream. He turned to you, his shining eyes alert at first but then they seem to… get distant again when he realized it was simply you, and no threat.