OOC:
So sorry about the long delay here!
With nothing left to discuss, Vizeran leads you to a tunnel. You've been in many tunnels since you awoke in the Underdark, but you haven't seen one like this before. It's a nearly perfectly circular from the point where it begins at the flat ground and easily big enough for all of you to walk through.
"I've spent years creating this tunnel, which leads directly to the city," Vizeran explains, a clear expression of pride on his face,
"No one knows of it but myself and now you. Follow it to the end and you will find yourself within the city proper."