The hall is the most important building in Call of Dragons. It is the foundation for your city's growth and opens up many new possibilities.

Specifically, the Great Hall allows you to:

• Unlock additional buildings: Upgrading the Great Hall will allow you to construct new buildings, such as Walls, Alliance Centers, and Warehouses. These buildings provide new functions and benefits, helping you develop your city.
• Increased Legion capacity: Upgrading the Great Hall will increase your Legion capacity, allowing you to send more troops on a march. This helps you fight more effectively and collect more resources.
• Unlock more armies: Reaching Great Hall level 22 will allow you to summon 5 Armies at once. This gives you more flexibility in your strategy and helps you achieve more goals at once.

The Alliance Center is an important building in Call of Dragons. It allows you get help from your allies, helping you develop your city and army faster.

Specifically, the Alliance Center offers:

• More help: Upgrading the Alliance Center will allow you to receive more help from your allies for activities such as research, building, and training. This helps you reduced time needed to complete important tasks.
• Strategic importance: The Alliance Center is an important part of your overall strategy. It allows you to cooperate with your allies for combat, research, and development.

The Research Center, Academy or Council plays an important role as the “brain” of your city. Upgrading this building brings the following benefits:

• Speed ​​up research: Reaching level 25 in the Research Center gives 25% speed increase for research processes, helping to reduce the time needed for all types of research.
• Unlock higher level soldier units: Upgrading allows you to unlock these soldier unit Level T3, T4 and T5, enhance the strength of your army.

The infirmary is an important building in Call of Dragons. It helps you Heal the legion after fighting, helping you get ready for the next battles.

Specifically, the dispensary provides:

• Increased strength: Upgrading the Infirmary will increase the overall strength of your city.
• HP Rewards: Maximizing the Infirmary will give a 2% HP bonus to all your troops.
• Increase healing ability: Upgrading your Infirmary will help you heal your troops faster and more effectively.

Training camps play an important role in the corps structure. When you upgrade them, you will reap the following benefits:

• Plus Defense and Attack: Different training camps provide special bonuses, such as overall defense improvements for flying units or increased attack capabilities for infantry.
• Strategic importance: Upgrading training camps will enhance your legion's performance, helping you execute stronger strategies in important matches.

There are a few other important projects:

• Rally Center: While it is necessary to upgrade the Stronghold, upgrading this hub requires significant resources and effort, and requires careful consideration.
• Watchtower: This tower is important in upgrading the research center to a higher level, but not as important as the other buildings.
• Walls and Watchtowers: These elements provide an additional layer of protection, however, taking full advantage requires support from powerful Heroes. Even with a fully upgraded wall, stopping the attack still depends on the presence of powerful Heroes.