I doubt that most people who farm lvl10 NPCs routinely use war horns. However, do remember that the standard war horn lasts 24 hours, and the Ivory Horn lasts 7 days, so you are able to get in quite a number of farming raids per horn if you plan it well....
As to where you get the horns, it's typically from the wheel with luck, or purchasing them out-right with game coins....I'm thinking this question was a rhetorical one....



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