Here is what traditionally is said of rangers:
The ranger is a warrior who use tracking and other wilderness skills to hunt down their enemies. Some are specialized in archery, some lean more towards assassin. Some of their skills require very light armor. They often have an animal companion, and they may aquire low level magic abilities. Rangers also often possess an animal empathy ability, enabling them to calm a frightened of hostile animal.
As the game goes on, we will find out more about Lowne and his skills.