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....
ya, I looked it up.
$1 per war horn and they last 24 hours. So $1/day or $30/month.
I don't see paying $30/month as a particularly good solution. Why should someone go to Compass 10 if it's going to cost them (an additional) $30/month from then on?
It'll be worth while if U're prinz and have 10 cities and can send 10 waves a time. U're able to raid the same NPC'10 4 times a day cause the maintenance instantly heals the troops and resources. On top of that Within the 8 hours cool down there's lots of time to hit other NPC'10 so it's still worth it.
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