Each level has terrain features which form bottlenecks or change the speed of units. The player controls specialized units belonging to a particular elemental group and most of the strategy revolves around the element of a given unit, its speciality and positioning. Each element is weak to one and strong versus another in a rock-paper-scissors system. Fire elemental units are strong against wind elemental units, while wind units are strong against water, and in turn water units are strong against fire. Earth-based units have no particular strengths or weaknesses to other elements. However, with the exception of the Princess(s) and Emperor Jyn the Earth-based units are all mages or healers and have a low base defence, making them vulnerable to combat units, unless they reach level 9 in which case they become the strongest unit in the game.