In contrast to normal Abilities, unit abilities are performed by the unit and not the player. All units have the ability "Heal", but certain abilities are more limited. These can be found in the bottom black bar when a Unit is selected, as can upgrades.
Using an ability takes up all your unit's actions and the unit will not be able to be used until next turn. You cannot use an ability if your unit has moved or attacked.
All units have this ability. This allows you to heal a certain amount of health points to the caster, but will use up its move (it will not be able to move or attack in that move). You may not heal if you have already attacked or moved.
If in your territory, the unit will heal 4 health. Everywhere else, it will heal 2.
If a unit has not done any actions in its turn, it will automatically heal.
This ability allows you to heal 4 health to all friendly units within a 3x3 radius except for the caster.
This ability allows you to convert all tiles in a 3x3 area centered on the caster into Polaris terrain, and freezes all water tiles into ice. This applies even if the caster has been converted to another tribe.
All units have this ability. It allows you to break all ice tiles within a 3x3 area centered on the caster. This does not affect Polaris land, and can only be used if adjacent to an ice tile.