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Merchant
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Some vendor NPCs are able to [[repair]] equipment and other functions, and while they mostly are not involved in [[quest]]s or have proper dialogues, they sometimes do that as well. The merchants in Diablo III are often NPCs who take part in side-stories, whether they are adventures in a desert cave, or even [[Event]]s like [[The Precious Ores]].
The terms just refer to the game mechanic of selling and buying goods and services to a [[NPC|non-player character]], and does in general not limit other functionalities like being a quest NPC or vital to the story line.