Alter Terrain

You touch the ground and change the terrain within 120 feet, centered on yourself. It becomes difficult terrain for every creature except the caster. This does not affect the inside of buildings or other constructed terrain. The caster chooses a terrain: Arctic, Coast, Desert, Forest, Grassland, Mountain, Swamp, Volcanic or the Underdark. The spell creates minor alterations to the land to resemble the chosen terrain. When the spell ends, the terrain returns to its original form and is no longer considered difficult terrain.