You have already brought me Dahrk Mezalf's ring.

Yes, this is the ring I was looking for. Since you have brought me the books and this ring, please take this storm ring with my gratitude.

Yes, this is the ring I was looking for. As a reward, I will order my centurion to assist you. You will find it waiting outside. I have made some improvements to this one. You may also find this storm ring to be of some minor use.

No, you do not have the ring. You will find the ring. You will give it to me.

If you bring me the ring, I will reward you. Until you have it, do not remind me of your laziness.

Did you find the Ring of Dahrk Mezalf?

Mezalf is sometimes referred to as "Mezalf Bthungthumz." Perhaps he was from the Dwemer village of Bthungthumz. Go to Maar Gan. Head east past the silt strider, then go north towards the Foyada. Follow the Foyada Bani-Dad to the northwest until you see what remains of Bthungthumz on the right. If you find the ring, bring it to me.