Trolls are liable to wide physical variation. All the models in a unit of Trolls are considered to be of the same type.

Stone Trolls

Stone Trolls have a tough, rocky hide and are all but immune to the effects of magic. They consequently have Magic Resistance (2) and Scaly Skin (5+).

River Trolls

Enemies attempting to attack a River Troll in close combat suffer a -1 penalty on their dice rolls to hit due to the stench and slime.