Speak to Veran, who will tell you he needs to find his wife a gift. As Veran's wife is fond of rare crystals, he asks you to purchase a special one - the Moon Eye Crystal - from his friend Edwin in Brumhill Village. He gives you 500 gold for the task and promises you further rewards. After reaching Brumhill (and completing Edwin from Brumhill in the process), collect the Moon Eye Crystal from the ground and return it to Veran. He will give you more gold and promise to mention you to the Merchants Guild.