Units are comprised of Commanders, Assault Units and Structures. Units are added to your Force according to the force structure, which is determined by Formation. Units are obtained from Barracks, Missions, War Chips, or Collection. Some Units are better for Player versus Player (PvP) combat while others are better for Player versus Epic (PVE) combat.
The Quality of a Unit is indicated by color of the unit's name. Ranking of Unit Quality from lowest to best is as follows: