Units are troops used for combat and expansion in Polytopia.
There are 37 unit types in Polytopia, and every type has unique stats and skills. The most basic unit type is the Warrior. Other types include the Rider, which has extra movement, and the Archer, which has a ranged attack. Every unit type is unlocked by a technology (except the Warrior, which is unlocked for all tribes at the start of the game). Some unit types are unique to a special tribe. Furthermore, every unit type has an unique icon shown at every unit's upper right on the map. For example, the icon for a Rider is shaped like the head of a horse. These icons can be used to determine which unit a naval vessel carries at a glance.
Units are primarily obtained by training them in cities. Every unit type has a specific cost. Also, a unit can be Disbanded, which removes the unit and returns half of its cost (rounded down).
A super unit is the most powerful unit of its tribe. They are primarily obtained through city upgrades. The super unit of all regular tribes is the Giant. Special tribes have unique super units.
Every tribe starts the game with one unit in its capital. Most tribes start with a Warrior. Those that do not typically start with a technology that unlocks a different unit type.
The aesthetics of every unit change based on the tribe it belongs to. Every tribe has a unique color and helmet. (In mirror matches where multiple players use the same tribe, different players of the same tribe are distinguished by different colors.) Also, the animals that mounted units (like the Rider) use vary from tribe to tribe. Finally, the Battleship has a tribe-specific decoration.
Once a unit kills three enemy units (through attacks or retaliation), it can be promoted to a veteran. Promoting a unit increases its maximum health by five and then heals the unit completely. Therefore, players may choose to save promotions to nullify later damage.