The Bearth Campaign

The Bearth campaign is named for the planet the adventure takes place on. The world of Bearth is similar in most ways to our Earth. The biggest difference is that an alien race landed on this planet covertly and built a machine that allows them to visit any time they wish. They began using agents to perform tasks in their past that would change the circumstances in their era that would allow them to return to their world or origin and conquer it by force.