Ravenloft: Curse of Strahd
Dangers abound in the land of Barovia. Check for a random encounter after every 30 minutes that the adventurers spend on the roads or in the wilderness (don't check if two random encounters occurred outdoors in the past 12 hours):
• On a road during the day, encounter occurs on a roll of 19+ on a d20.
• On a road at night, encounter occurs on a roll of 17+ on a d20.
• In the wilderness during the day, encounter on a roll of 16+ on a d20.
• In the wilderness at night, encounter occurs on a roll of 14+ on a d20.