The Runewright is a craftsman introduced in the Hearts of Stone Expansion for The Witcher 3: Wild Hunt. He and his younger companion who sells good to locals both came from a Ofier. Runewright uses his arcane knowledge to considerably improve Geralt's equipment.
He describes profession of runewright as being part smith and part mage. There are three "tiers" of being runewright - amateur, journeyman and master. Worthy note is also fact that this art is very expensive. Amateur level enchanting costs 5,000, journeyman costs 10,000 and master level costs 15,000.
Associated quests Edit
If you have the necessary runes for enchanting, he does it for free (checked with patch 1.31).