We're Not in Kansas Anymore
If Jude is still alive, he won't continue any further, but will offer you another 50 Gold to look for his father.
"Jude has paid me 50 septims to continue through the portal, without waiting to see if I would accept the job. He is right, his father is obviously dead, and I don't blame him for not wanting to see may be on the other side of this portal. I could just take his money and leave. But I must confess I am curious about where this leads. Who knows what adventure I might find. Death, fame, fortune? There is only one way to find out. "
Otherwise, your quest continues like this.
"Jude's father is obviously dead, most likely his remains are on the other side of this portal. I could just leave, but I must confess I am curious about where this leads. Who knows what adventure I might find. Death, fame, fortune? There is only one way to find out."
"I have found Jeb's remains. Perhaps it is for the better that Jude did not see this. I may have done what I came here to accomplish. But this apparently forgotten portal is indeed a mystery. I may never find out how built it or why, but I would certainly like to see where this leads. Will it reveal some forgotten treasure? Was it used for some kind of quick transportation? I should continue on and see if there is an exit."
"Whatever happened here, happened a very long time ago. Long before Jeb Thadius ran across the portal he found. I have no idea what this letter is about, or who Hyreechus was. But there is obviously some kind of exit from these caves."
When you approach the door to exit this cave, your log updates again and the quest completes.
"So there is an exit on this side of the portal. I came this far, I may as well go through the door and find out where this leads."