Warhorn

The Horn of Conquest is an item that is expected to be added in the upcoming Beta.

Obtaining
This horn is obtained by talking to any unit hiring NPC. You'll find the Horn of Conquest in the top right corner of the unit hiring screen. They are fairly expensive, so it may take some time for you to acquire enough money and alignment for you to buy one.

Usage
This horn is used in the same way as a Horn of Command, but the effect produced by this horn is very different. Instead of commanding hired units, blowing this horn will instantly spawn an invasion of friendly units at the location you're standing. Warning! This horn can only be used once! So when you use it, make sure that it is going to be worth the expense.

Good times to use this horn would include attacking an enemy fort, defending your fort against enemies, or defending yourself against an invasion.