The Battlefield was expansive, divided into nine zones, further divided by regions and various terrains, from muddy, to flat ground, to mountainous, to littered with various bodies of water, to filled with foliage and tree life. These environments were diverse, yet they were all tainted by the murky air, the turbid light, and horrific environmental conditions.
In these circumstances, the water was poisonous, the plants dispersed toxic spores into the air, the mountains were prone to collapse at a moment's notice, and the flat ground was a location without cover or protective sightlines. They all held their own disadvantages requiring armies to adapt or suffer.