"Lets you test the mettle of your City- let us see if these defenses will hold by attracting Wild Savages! If you are way above your head, you can always call off the self-inflicted atack"
The Tusk Horn is a special building which can be used to test you city design and your city defenses. With each level you can use more mercenaries to attack your city. Also at different levels you can use different types of catapult attacks.
Beasts and Blacksmith items are not available in the Tusk Horn