Twilight armor quest help

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I just left Glooming deep mines and started the twilight armor questline.
Now, I've gone to Beaufy got the crystal and went to the twilight sea, however there isn't any information on who I'm supposed to give the crystal to so I handed it to the first guy i saw.

He gave me a bard breastplate, which was good, however I'm a necromancer so this is really useless to me. I returned to Beaufy who is now a merchant and won't give me another crystal.

What do I do here? I searched online and can't seem to find anything to help me.