Infantry, Warrior, Warg
An Infantry model with this special rule may move through woods and forests that are classified as difficult terrain as if they are open ground. Note that this doesn’t mean they can automatically climb terrain in those areas, nor move through tree trunks or jump fallen Obstacles.
Mountain Dwellers may re-roll any Jump, Leap and Climb tests. In addition, they may move through rocky areas that are classified as difficult terrain as if they were open ground.