Trade for a Dunmer book, Dunmer clothing, Dunmer relic
I can find the items Rigurt wants in Muth Gnaar, Shad Astula and the crafting district of Mournhold. I may have to convince the Dark Elves to trade, however, as they probably aren't aware of this Nord tradition.
Talk to the Rigurt the Brash
I made the necessary cultural exchanges. I should bring the Dunmer book, relic and clothing back to Rigurt the Brash.
— game journal