As a ranger, he can use his knowledge to survive in the woods, hide from his enemies,etc. And, as in Baldur's Gate, each ranger has certain types of creeatures that are easier for him to find and kill, because of that woodsman experience. Cleric This is a priest that dedicates his life to a certain god. By praying for that god every day, the priest is granted extra spells. Their faith will also determine what kind of armor they can wear and weapons they can use.
Clerics can also turn undead and control the undead.
Every cleric has a core spell list plus access to 2 spell domains. Druid A druid is a priest that controls the wilderness. Their spell casting is similar to that of the cleric, though druids get their abilities from nature instead of the gods. Most of their spells involve nature or animals. Besides spells, druids also recieve magical powers as they gain experience.