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 any tree trunks or jump falled Obstacles.
If a model with this special rule is partially concealed from view by a piece of terrain, they cannot be seen at all at distances of more than 6" - they appear to melt into the background. This means that enemies cannot Charge, Shoot, or target them with Magical Powers of special rules at ranges of greater than 6", unless they have a completely clear view of the target. If the model is ridng a mount, Stalk Unseen has no effect.
A model with this special rule adds 1 to their To Wound rolls when fighting in combat against the models with the keyword listed in the brackets in its profile. For example, a model that has the Hatred (Man) special rule will get +1 to their To Wound rolls against all models with the Man keyword. A model that has the Hatred (Mordor) special rule will get +1 to their To Wound rolls against all models with the Mordor keyword.
6"
3/3+
3
1
Man Infantry Warrior