Non-player character, Old School RuneScape Wiki

A Non-player character, or NPC, is a character not controlled by a player. As such, NPCs are computer-controlled characters with pre-defined functions, paths, and methods to enhance players' immersion to the game. Players can usually talk to NPCs, but they are not attackable. (If they are attackable, they are considered monsters.) They include store owners, quest contacts, bankers and civilians. NPCs can give out quests, sell items, restrict access to certain areas and perform other vital duties

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