A merchant is a buyer and seller of items that can be found in any village, town or city. They sell you items for gold and they buy items in exchange for gold. There are many different types of merchants. Some are Brotherhood members who deal in armour an weapons. Some are from the Merchants Guild who deal in most items. Some are from the Giriza who deal in items for Assassins and Thieves, among them, Lockpicks. Others are from the Necromancers and the Society who deal in magical items. Although the former are the only ones that deal in Necromancy spell items and Necro staves.