Ugh... Please free me from these tortuous thoughts...!

The Voice of Arbolu told me this:

Arbolu himself suggested facing up to the cause of these thoughts. Then a way out would present itself.

Please meet with Raninia and enter the nightmare to get to the root of things.
You don't have to say anything.

You're here to find the cause of these thoughts, aren't you?

If you want, I'll go with you into the dream that's causing these thoughts, Player.

But be careful. If you can't control the dream, you'll be trapped within it forever.

If you still want to go in, then take my hand. I'll lead you into the nightmare.
So, the nightmare summoned thoughts of Kromede and Robstin.

May their souls find peace now...