The Castle Gate defines the power of your castle wall and the general defensive possibilities. By upgrading the Castle Gate you can build additional defensive fortifications and extend the paths an aggressor has to navigate to reach your Castle Gate.
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General Assessment[]
Upgrading your Castle Gate is fundamental to the improvement of your defense. The higher is the level the more of each defense type you are allowed to have, and the longer your path can be. With a longer possible path, the time an attacker is given to raid your castle is also increased (regardless of whether you use the entire length). Higher levels also come with more health and higher damage. Every new level also raises the max level of the Treasure Chamber. The Castle Gate's damage is quite insignificant at lower levels, but as you fight harder bases, the castle gate can severely damage or kill your Hero and Units.