Isarus stretches a wide range of different biomes. Much of it includes temperate zones, with distinct seasonal changes throughout the year. Certain areas of the territory fall out of mundanity, with a distinct shift from their surrounding environment. Isarus holds two major mountain ranges: The Storm Horns and the Wintercrest Mountains. Previously, the Storm Horns experienced high winds and frequent rainfall. However, with the closure of the rift to the elemental plane of air, this region is likely to be subject to entirely new weather patterns, drastically altering the ecosystem. The Wintercrest Mountains act as a natural barrier between The Kingdom of Isarus and . The majority of Isarus is covered in grasslands or forests. Outliers from this include the southern Mandrake Mire and the northeastern Mandehanwei Rainforest.