Idea #1: Guards that stop you to ask where you're going and what you're doing. Once you tell them, they explain that they're out patrolling the lands for Skeletons or Kobolds or Bandits... If you complete this roving encounter you'll no longer be stopped by these guards on the overland map and instead you'll know this is a sign that the road is clear. Idea #2: You see guards fighting something. If you get close enough you're drawn into the scene. It appears there's been an ambush of the guards you spoke to earlier! Which side do you fight on? You can kill any of the participants in the scene. The Oracle is watching! Once you have completed this encounter it may come up again. Idea #3: A shadowy figure roams the forest. When you move close enough you are pulled into the scene and the shadowy figure reveals itself as one of the following, the beginning of an ambush, a traveling merchant, a quest giver, a lost child, a trickster, etc... This encounter is mysterious by design. You never know what you'll get next.