Dark gates open over your kingdom. You need to rush to build fortresses to protect the kingdom from the invading dark armies.
The game has many levels. Each level is an area of your kingdom that is being invaded.
Areas are expanded by level, the shadow army is more numerous and stronger at higher levels.
During the defense of the kingdom. You will have the opportunity to receive precious gems, special items... they will help you upgrade your fortress, weapons... faster and stronger. so you can protect your kingdom.