Posters are hang up around the prominent places of Lower, upon examination, they read:

I seek to buy the Noctivur rings, these rings are silver in colour with a bold letter "N" inscribed on them. They are also able of granting the wearer's eyes the magical ability of piercing through the darkness. if you have possession of these rings then leave a letter for me by the Crone and we can discuss further.

Morghur - Warsinger of the Unblinking Eye