They can make a defense easier and can strengthen an overall level of your fortress.
On this page of our guide we present, you might find a list of upgrades our types.
The stronger the wall, the longer it takes for attackers to perform a siege.
Iron Gates are a safe and good choice too.
Their resistance makes them the best out of the three upgrades.
A War Graug is also a good option although some captains have no problems in dealing with them.
Slot 5 - available upgrades:
Which are the best-Fire Archers.
I strongly recommend this upgrade because archers, both during defense and attacks, are very powerful.
Their ability to set enemies on fire helps a lot.
Slot 6 - available upgrades:
Which are the best-a rather difficult choice.
Personally, I prefer Fire Mines but Poison Mines are also very good.
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