How Mar de Oro Plays

Mar de Oro is built around a simple idea: fantastic events still happen to human beings.

People rarely possess the whole truth. They act through loyalty, fear, ambition, duty, prejudice, affection, desperation, and the information available to them at the time.

That means conflict is rarely divided neatly between good people and bad people.

A governor trying to prevent panic may hide information that others desperately need. A naval officer may obey an order because refusing it could cost hundreds of lives somewhere else. Workers may conceal evidence because experience has taught them not to trust the authorities asking for it. An enemy may be completely wrong about what is happening while still behaving rationally according to what they believe.

Mar de Oro does not ask the table to discover which side the author has declared correct.

It asks:

What do these people believe? Why do they believe it? What will they do because of it? And what happens after the characters intervene?

Characters are often expected to act before they understand everything.

Information can be delayed, incomplete, deliberately hidden, misunderstood, or interpreted differently by people with different experiences.

Discovering more should change the characters' options, but it does not necessarily make the eventual decision easier.

An investigation is therefore not simply a sequence of rolls until the GM reveals the answer.

A new piece of information may expose a lie, create leverage, reveal another interested faction, undermine an ally, or make yesterday's sensible decision look dangerous today.

The more the characters learn, the more the situation can change around them.

The question is not whether the characters can uncover every fact.

What do they choose to do with the facts they have?

The world does not wait for the player characters.

Governments issue orders. Officers protect their commands. Merchants protect investments. Families protect one another. Rivals exploit opportunities. Institutions attempt to preserve authority.

People who are frightened make decisions before anyone has enough information to know whether those decisions were wise.

This is especially important when running factions.

A faction is not automatically an ally or an enemy. It has interests.

Those interests may align with the characters in one scene and collide with them in the next.

When deciding how someone reacts, begin with three questions:

• What do they want?
• What are they afraid will happen?
• What do they currently believe is happening?

The answers usually matter more than whether the adventure originally introduced them as friendly or hostile.

Mar de Oro is not built around returning the world to its starting position after every adventure.

What the characters expose, conceal, destroy, protect, misunderstand, or allow to happen can become part of the setting going forward.

A successful operation may still create political enemies.

Saving a person may mean losing evidence.

Preventing immediate disaster may place something dangerous under the control of an institution the characters do not trust.

Revealing the truth may create consequences that hiding it would have avoided.

The purpose is not to punish players for making choices. It is to make those choices matter.

When an adventure ends, the useful question is often not “Did they win?”

What is true now because these characters were here?

GM example, minor spoilers.

In The San Telmo Incident, the characters may end up holding evidence that more than one party wants. They might hand it to the authorities, keep it, pass it to someone they trust, or give it up to protect a person in danger. The adventure does not decide which choice is right, and neither should the GM.

Whatever happens, the San Telmo ending record notes who holds the evidence, who was kept safe, and where the characters now stand. You can edit it to match your table, and the relevant details carry into the campaign save.

When the story continues in Ash on the Ledger, those results still hold. Rescued people stay rescued, the evidence stays where it went, and the political position the characters gained or lost comes with them.

Follow these choices from The San Telmo Incident into Ash on the Ledger.

Mar de Oro presents situations rather than predetermined moral answers.

There may be better and worse choices. Characters may make terrible mistakes. Some people may behave cruelly, selfishly, or dishonestly.

But the setting should not require the players to identify the route the author intended them to follow.

If the characters find a solution the adventure did not anticipate, the world should respond to it.

If they side with someone the GM expected them to oppose, that decision becomes part of the story.

If they misunderstand what is happening, the consequences of that misunderstanding may become more interesting than correcting them immediately.

The GM's job is not to protect the plot. It is to understand the situation well enough to let it react.

Mar de Oro is system-neutral because the setting and the rules engine perform different jobs.

The setting establishes what is happening.

• Who has authority?
• What does a faction want?
• What does the crew know?
• What is physically possible?
• What happens if they wait?
• What is at risk?

Once those things are understood, the table can use whichever rules system it prefers to resolve uncertainty.

• Tales of Mar de Oro: Native Rules is the complete first-party game, expressing the same uncertainty through 2d6 + Capability, Risk, Effect, consequences, Harm, and clocks.
• D&D 5e may express a dangerous situation through checks, conditions, exhaustion, combat, class abilities, or the Mar de Oro conversion rules.
• Pathfinder First Edition may express the same situation through its own action, hazard, and encounter structures.
• Pathfinder 2e Remastered may express it through actions, hazards, conditions, degrees of success, and its own encounter structure.
• Forged in the Dark may express it through position, effect, stress, clocks, and consequences.
• The lightweight 2d6 Resolution Bridge can resolve the same uncertainty with little more than a capability rating and the consequences of the roll.

The mathematics can change. The situation should not.

The system conversions are not intended to turn Mar de Oro into several different settings. They are compatibility layers.

Our own campaign began in D&D 5e, which is why the 5e conversion became particularly extensive.

Other groups may already know Pathfinder, prefer Forged in the Dark, want something much lighter, or choose a system we have never supported directly.

We do not want learning an entirely new game to be the price of entering the setting.

The goal is to reduce friction while preserving the things that make Mar de Oro recognisable at the table: incomplete information; human motives; factions with their own interests; persistent consequences; dangerous technology; political pressure; and player decisions that continue to matter after the immediate problem has been solved.

If your group already has a rules system it loves, use it. If you want the lightest possible rules expression of these ideas, use the 2d6 Bridge.

Either way, the world remains Mar de Oro.

The 2d6 Bridge exists for groups that want to play Mar de Oro without importing a larger rules engine. It is deliberately small.

Its purpose is not to reproduce everything that D&D, Pathfinder, Forged in the Dark, or another complete RPG already does. It exists to answer one question quickly: what happens when a character attempts something uncertain and the result matters?

Before rolling, establish what the character wants and what is at risk.

A strong result gives them what they were trying to achieve.

A mixed result moves the situation forward but introduces a cost, complication, exposure, difficult choice, or new pressure.

Failure should not normally mean that nothing happens. It means the situation changes in a way the characters would rather it had not.

A locked office does not simply remain locked forever because an investigation roll failed. Perhaps the characters get inside after attracting attention. Perhaps the document they wanted has already been moved. Perhaps someone else now knows they were looking for it.

The story continues. The circumstances become more complicated. That is the role of the Bridge.

The full rules for it live in the 2d6 Resolution Bridge.

When preparing a Mar de Oro situation, begin with people rather than encounters. Understand who is involved, what each side wants, what each side fears, and what they currently believe.

Then establish the pressure. Something is changing. Someone is running out of time. An institution is preparing to act. A ship is approaching. Evidence is disappearing. Machinery is becoming unstable. A decision will soon be made whether the characters are ready or not.

Let the characters investigate and interfere. As they do, allow the world to react.

Do not require every clue to be found in one particular place. If information is necessary for play to continue, allow it to surface through another route, perhaps at a different cost.

Do not protect planned scenes simply because they were planned.

When the characters finally act, follow the consequences far enough that their decision becomes part of the world.

That is the core Mar de Oro play loop:

1. Pressure creates action.
2. Action reveals information.
3. Information changes relationships.
4. Relationships force choices.
5. Choices leave consequences.