Mount Celsius is a mountain range located to the west of the city of Atlas. It is the largest mountain range in the world and is known to have incredibly gusts of winds passing through it. Additionally, the mountain is known for its extreme temperature, being well below the average temperature for the continent. As such, it is difficult to sustain life within the mountain, aside from the grimm of course. Most of the mountain range is coated in ice as well, making it one of the most difficult places to scale in the world given the slippery surfaces lining the range. On the furthest side from the city is a small tunnel located at the base of the mountain range. This is where The Wanderers have decided to set up their branch, preferring to live in a nearly inhospitable place.

One of the most dangerous grimm are known to inhabit these mountains. Those are the Griffons that prove to be some of the fiercest foes known to huntsmen and huntresses. They fly around the mountain range searching for the victims, waiting for the perfect moment to strike. Nevermore are also fairly abundant here, although not nearly as much as the Griffons. There is also an infestation of Boarbatusks.