Command An Army Mastery System Guide

Mastery is per-unit long-term progression: field a unit in raids and it accumulates mastery experience that converts into permanent passive bonuses — small stat gains that persist forever and stack with every other system. Community estimates put individual mastery steps at a few percent each, with the totals becoming seriously noticeable only at higher mastery levels, which makes mastery a patience system rather than a purchase decision. The strategic content is entirely in focus: mastery spread across fourteen units is mastery wasted; concentrated on the two or three units you always field, it is free permanent power that accrues while you play normally.

Mastery grows from fielding the unit — raids, offline attacks and the general grind all feed it, which pairs naturally with the game's offline-earning loop: an army you leave fielded overnight is also an army earning mastery overnight. Each mastery level grants a small permanent stat bonus to that unit family (health, damage, or the unit's special stat — heal rate for the Healer, aura strength for the boost units, per community observation), and the cost of each next level rises while the gain stays flat. That curve is the whole strategy: early mastery levels are efficient on everything, and past the first few levels only your permanent army deserves the grind.

By role, the priority is unglamorous and consistent across community tracking. Tanks first: mastery HP on the Golem and Titan directly extends every push, and HP is the stat late-game waves test hardest. Damage second: Wizard and Dragon mastery converts to faster wave clears, which shortens raids and increases cash per hour. Support third but rising fast: Healer mastery scales heal rate, and a maxed-mastery Healer is a common feature of the longest recorded pushes. Boost units last — aura mastery is real but a percentage of a percentage, and only worth grinding once the units the aura multiplies are themselves strong.

• Tank mastery (Golem, Titan) — HP; extends every raid you run, forever.
• Caster mastery (Wizard, Dragon, Witch) — damage; faster waves, more cash per hour.
• Support mastery (Healer) — heal rate; the longest pushes in the community all run healed walls.
• Boost mastery (Captain Commander, Rookie Commander) — aura strength; last, and only on the Captain.