Trolls are large, sly, and generally nasty. The common northern hemisphere Troll is extremely sensitive to sunlight, so he lives in dark places and travels mainly at night. These are often known as Cave Trolls. The skin of a Troll is like heavy armor and resists damage from weapons and fire. Unfortunately, the common southern hemisphere Troll, while not as tough as his cousin, has a disgusting habit of rapid regeneration and can heal wounds almost as quickly as a Hero can make them. Fire prevents such regeneration. In general, it is always wise to know which hemisphere one is in when dealing with Trolls. The beard of a Troll is frequently used in making potions.