Embassy

"Upgrading your Embassy increases the capacity of reinforcements you can hold. The owners of reinforcing Troop pay for their own upkeep. The Embassy is an important building which will help you defend against attacks from your enemies. Be sure to ask your Alliance members for help whenever needed."

When you are the victim of a rally, your alliance will automatically be notified to send you troops.
 * Level 21 Additional Benefits: 10% Embassy Defence Bonus