Armories are built from a University of at least level 3.
Each building level, an armory is granted a number of upgrade points equal to its current building level. For example, when an armory is upgraded from level 3 to level 4 it is granted 4 additional upgrade points to spend on upgrades.
Each upgrade grants your units 2% damage mitigation against the specified unit type per level, and upgrades cost progressively more upgrade points per level. The available upgrades are:
- Archer Defensive Boost
- Catapult Defensive Boost
- Cavalry Defensive Boost
- Gladiator Defensive Boost
- Helepolis Defensive Boost
- Hoplite Defensive Boost
- Knight Defensive Boost
- Swordsman Defensive Boost
All structure and unit stats, cost to upgrade per level, and other abilities can be seen on the Official Database Entry
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