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Old-School Essentials Classic Fantasy: Adventures
Full rules for adventuring in dungeons, the wilderness, and at sea. Guidelines for designing and running adventures.
48 pages, Hardcover
Published January 1, 2022
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June 11, 2026
This is the third book in the Old-School Essentials Classic Fantasy boxed set, and it may be one of the most valuable volumes for a referee.
The first section focuses on Adventuring, providing the procedures used during actual play. It begins by introducing the roles of the caller and mapper, two concepts that are often absent from modern roleplaying games. The caller helps organize party actions by communicating the group’s intentions to the referee, reducing confusion and keeping play moving smoothly. The mapper creates a record of the party’s exploration, helping players navigate dangerous environments and avoid becoming lost. Together, these roles encourage teamwork, communication, and player engagement while reinforcing one of the core principles of old-school play: players succeed through organization, planning, and careful decision-making rather than relying solely on character abilities.
The gameplay procedures themselves are simple and easy to understand. OSE provides enough structure to establish clear expectations while leaving room for referee rulings when unusual situations arise. Importantly, the game assumes that rulings should be consistent and fair. Rather than attempting to cover every possible situation with detailed rules, the system trusts referees to make reasonable decisions and apply them consistently. This approach preserves the spirit of old-school gaming, where flexibility and common sense are valued, but consistency remains essential so that players can make informed decisions based on how the world works.
The book places significant emphasis on three major styles of adventure: dungeon exploration, wilderness exploration, and waterborne travel.
The dungeon exploration procedures are particularly strong. One feature I appreciate is that the referee is expected to make certain rolls on behalf of the players, such as searching for hidden features or listening at doors. This allows players to focus on describing their actions rather than reacting to die results. Instead of seeing a failed roll and immediately suspecting something was missed, players must trust the information provided by the referee and make decisions based on what their characters perceive. This creates greater immersion and uncertainty while encouraging players to interact with the game world rather than the game mechanics.
The “one check” approach is equally effective. If a player searches an area and fails, they generally do not receive unlimited attempts until they succeed. Their decision matters, and the outcome stands. However, other characters may still contribute their own efforts, encouraging cooperation rather than repetitive die rolling. This reinforces player agency by making choices meaningful and encourages players to think creatively when a straightforward solution fails.
Dungeon procedures also create meaningful tension through resource management. Exploration takes time, torches burn down, spells are expended, and wandering monsters may appear. Players must constantly balance caution against speed, deciding whether the potential reward is worth the growing risk. This creates a natural sense of suspense without requiring the referee to artificially increase the danger.
The wilderness exploration rules provide similarly useful procedures for overland travel. Characters may become lost, encounter wandering creatures, hunt for food, forage for supplies, or face unexpected challenges while traveling. The rules remain concise while providing enough structure to make wilderness exploration feel like a meaningful part of the game rather than a simple transition between locations.
Waterborne adventuring receives the same thoughtful treatment. The rules cover navigation, weather conditions, wind direction, ship movement, food and water supplies, and the possibility of becoming lost at sea. As with the rest of OSE, the procedures are straightforward and easy to reference while giving referees a solid framework for running maritime campaigns. The system provides guidance without becoming restrictive, allowing referees to adapt situations as needed.
The combat section continues this philosophy. Combat rules are streamlined and efficient, making encounters quick to run while still allowing for tactical decision-making. The inclusion of morale rules is particularly important, as monsters and NPCs are not assumed to fight to the death. Enemies may retreat, surrender, or flee when the situation turns against them, creating more believable encounters and encouraging solutions beyond simple combat. Alternate rules throughout the section allow groups to customize the experience while remaining compatible with the core game.
The second half of the book shifts focus to the referee, beginning with the excellent Running Adventures section. The discussion of the referee’s role provides some of the best advice available for new Game Masters. It emphasizes fairness, neutrality, consistency, and presenting the world honestly rather than attempting to control outcomes. Players are free to succeed or fail based on their decisions, and the referee’s responsibility is to adjudicate those decisions fairly.
The section also covers practical topics such as handling player characters, running monsters and NPCs, designing dungeons, and creating wilderness regions. One of my favorite pieces of advice is that intelligent enemies should learn from previous encounters. If adventurers attack a group of enemies and then retreat, those enemies are expected to adapt their defenses, prepare countermeasures, or alter their tactics. This simple guideline helps the game world feel responsive and alive while rewarding players who think strategically.
The dungeon design procedures are another highlight. What can often seem like an intimidating task is broken down into a series of clear, manageable steps. The process is easy to follow while still leaving ample room for creativity. New referees are given practical tools rather than abstract theory, making it far easier to begin creating their own adventures.
Overall, this book exemplifies what makes Old-School Essentials so effective. It provides clear procedures, practical guidance, and a strong framework for play without overwhelming the referee with complexity. Whether teaching new referees how to run a game or helping experienced referees refine their craft, it succeeds at making old-school adventure gaming approachable, organized, and highly rewarding.
The first section focuses on Adventuring, providing the procedures used during actual play. It begins by introducing the roles of the caller and mapper, two concepts that are often absent from modern roleplaying games. The caller helps organize party actions by communicating the group’s intentions to the referee, reducing confusion and keeping play moving smoothly. The mapper creates a record of the party’s exploration, helping players navigate dangerous environments and avoid becoming lost. Together, these roles encourage teamwork, communication, and player engagement while reinforcing one of the core principles of old-school play: players succeed through organization, planning, and careful decision-making rather than relying solely on character abilities.
The gameplay procedures themselves are simple and easy to understand. OSE provides enough structure to establish clear expectations while leaving room for referee rulings when unusual situations arise. Importantly, the game assumes that rulings should be consistent and fair. Rather than attempting to cover every possible situation with detailed rules, the system trusts referees to make reasonable decisions and apply them consistently. This approach preserves the spirit of old-school gaming, where flexibility and common sense are valued, but consistency remains essential so that players can make informed decisions based on how the world works.
The book places significant emphasis on three major styles of adventure: dungeon exploration, wilderness exploration, and waterborne travel.
The dungeon exploration procedures are particularly strong. One feature I appreciate is that the referee is expected to make certain rolls on behalf of the players, such as searching for hidden features or listening at doors. This allows players to focus on describing their actions rather than reacting to die results. Instead of seeing a failed roll and immediately suspecting something was missed, players must trust the information provided by the referee and make decisions based on what their characters perceive. This creates greater immersion and uncertainty while encouraging players to interact with the game world rather than the game mechanics.
The “one check” approach is equally effective. If a player searches an area and fails, they generally do not receive unlimited attempts until they succeed. Their decision matters, and the outcome stands. However, other characters may still contribute their own efforts, encouraging cooperation rather than repetitive die rolling. This reinforces player agency by making choices meaningful and encourages players to think creatively when a straightforward solution fails.
Dungeon procedures also create meaningful tension through resource management. Exploration takes time, torches burn down, spells are expended, and wandering monsters may appear. Players must constantly balance caution against speed, deciding whether the potential reward is worth the growing risk. This creates a natural sense of suspense without requiring the referee to artificially increase the danger.
The wilderness exploration rules provide similarly useful procedures for overland travel. Characters may become lost, encounter wandering creatures, hunt for food, forage for supplies, or face unexpected challenges while traveling. The rules remain concise while providing enough structure to make wilderness exploration feel like a meaningful part of the game rather than a simple transition between locations.
Waterborne adventuring receives the same thoughtful treatment. The rules cover navigation, weather conditions, wind direction, ship movement, food and water supplies, and the possibility of becoming lost at sea. As with the rest of OSE, the procedures are straightforward and easy to reference while giving referees a solid framework for running maritime campaigns. The system provides guidance without becoming restrictive, allowing referees to adapt situations as needed.
The combat section continues this philosophy. Combat rules are streamlined and efficient, making encounters quick to run while still allowing for tactical decision-making. The inclusion of morale rules is particularly important, as monsters and NPCs are not assumed to fight to the death. Enemies may retreat, surrender, or flee when the situation turns against them, creating more believable encounters and encouraging solutions beyond simple combat. Alternate rules throughout the section allow groups to customize the experience while remaining compatible with the core game.
The second half of the book shifts focus to the referee, beginning with the excellent Running Adventures section. The discussion of the referee’s role provides some of the best advice available for new Game Masters. It emphasizes fairness, neutrality, consistency, and presenting the world honestly rather than attempting to control outcomes. Players are free to succeed or fail based on their decisions, and the referee’s responsibility is to adjudicate those decisions fairly.
The section also covers practical topics such as handling player characters, running monsters and NPCs, designing dungeons, and creating wilderness regions. One of my favorite pieces of advice is that intelligent enemies should learn from previous encounters. If adventurers attack a group of enemies and then retreat, those enemies are expected to adapt their defenses, prepare countermeasures, or alter their tactics. This simple guideline helps the game world feel responsive and alive while rewarding players who think strategically.
The dungeon design procedures are another highlight. What can often seem like an intimidating task is broken down into a series of clear, manageable steps. The process is easy to follow while still leaving ample room for creativity. New referees are given practical tools rather than abstract theory, making it far easier to begin creating their own adventures.
Overall, this book exemplifies what makes Old-School Essentials so effective. It provides clear procedures, practical guidance, and a strong framework for play without overwhelming the referee with complexity. Whether teaching new referees how to run a game or helping experienced referees refine their craft, it succeeds at making old-school adventure gaming approachable, organized, and highly rewarding.
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