Sci-Fi Maritime Drama Sci-FiHydromancyOceanMaritimeTradeMonopolyWater MagicFree Waters

Tidal Authority: The Hydromantic Ocean

Current Control, Maritime Trade Monopolies, and the Free Waters Movement

By Alex Merced · Published 2026-07-31 · Online Supplements

The Tidal Authority controls ocean commerce across three continents by controlling the ocean currents themselves. Hydromantic engineers maintain the Current Grid - a network of permanent water-magic installations that shape, direct, and regulate major shipping currents. The fastest trade routes require the Grid. The Grid requires licensing. Tidal Authority licensing requires fees, inspections, political compliance, and a 3% current-use tax on all cargo value. Nations that resist the Authority's licensing terms find their shipping routed through slower, less stable natural currents. Nations that comply find their competitors given better routing. This is not presented as coercive. It is presented as infrastructure management. The Free Waters Movement argues that the ocean is not infrastructure anyone should own. The Authority argues that someone has to maintain the Current Grid, and maintenance is not free.

Core Mechanic: Current Riding and Navigation: Hydromancers have a Current Sense (1-6) representing their attunement to magical water flows. At Current Sense 3+, a character can navigate Grid-controlled currents at full speed without a licensed guide, and sense approaching current changes up to 1 hour before they occur. At Current Sense 5+, a character can access unofficial current channels - natural flows not in the Authority's system - treating them as if Grid-licensed. A character with Current Sense 5+ can also detect Grid installations within 5 km as a free action, making them invaluable to the Free Waters Movement's infrastructure mapping project.

“The current will take your ship from Sela Port to the Northern Markets in 8 days with a licensed guide. Without one, plan for 22. We did not create the difference. We made it consistent. You are welcome.”

  • Tidal Authority promotional materials for new shipping licenses

1. Setting Overview

The Tidal Authority was chartered as a public infrastructure organization 50 years ago and has behaved as a trade monopoly for the last 40. The transition was gradual enough that no single decision was the moment you would point to. The Authority extended the Current Grid, added licensing requirements, raised fees, and used routing advantages as diplomatic tools, and at no point did the charter technically prohibit any of it.

The Free Waters Movement is not a piracy organization, despite Authority characterizations. Its members include hydrographers, maritime historians, independent shipping operators, and fishing communities whose traditional routes are now technically unlicensed. They are mapping the natural current system - the ocean before the Grid - and arguing that it is a viable alternative. The Authority calls this an infrastructure undermining campaign.

Tone: Maritime political drama. The ocean is the most important place in the world, and the question of who gets to decide how it works is a question about power as much as water.

2. The Current Economy

Licensed Grid Operators are hydromancers contracted by the Tidal Authority to maintain specific current installations and guide commercial shipping through their assigned corridor. They are well paid, regulated, and required to report any Free Waters Movement activity they observe.

Independent Hydromancers operate outside the Grid, navigating natural currents. They are slower, cheaper, and technically legal - the Authority cannot prohibit navigation of natural currents, only require licensing for Grid access. The Authority has been working on regulatory language to change this for 5 years.

The Free Waters Cartography Project is the Movement’s ongoing effort to produce a complete map of pre-Grid natural currents. If complete, it would give independent shipping a navigable alternative to the Grid. The Authority has interfered with three previous mapping expeditions.

3. Factions

The Tidal Authority - The current monopolist. Legitimate, chartered, and behaving consistently with what institutions do when they have both a mandate and a market position.

The Free Waters Movement - Advocacy organization with a technical project (cartography) and a political one (charter reform). Underfunded. Has significant public sympathy among coastal communities.

The Merchant Dissidents - Commercial shipping operators who use the Grid but are increasingly open to the Free Waters alternative, because Authority fee increases have begun to affect profitability seriously.

4. Unique Mechanic

Current Sense (1-6):

  • 3+: Navigate Grid currents without licensed guide at full speed. Sense current changes 1 hour early.
  • 5+: Access natural unofficial current channels as if Grid-licensed.
  • 5+: Detect Grid installations within 5 km as a free action.

5. Character Archetypes

The Cartography Expedition Leader

Running the Free Waters Movement’s fourth mapping attempt. Has route data from the first three expeditions that were shut down before completion. Needs to complete the northern corridor survey before the Authority figures out where the expedition is.

  • Drive: “Complete the northern corridor before the Authority’s surveillance coverage reaches the mapping zone.”
  • Approach Distribution: Force 1 | Finesse 2 | Mind 3 | Presence 2

The Merchant Dissident

Third-generation shipping operator. Has been a licensed Grid user for 20 years. The latest fee increase puts her operating margin negative. Has quietly contacted the Free Waters Movement about natural current viability for her primary routes.

  • Drive: “Assess whether the natural current alternative is commercially viable before the next Authority licensing renewal.”
  • Approach Distribution: Force 1 | Finesse 2 | Mind 2 | Presence 3

6. Starter Scenario

The Lost Installation: The Cartography Project has found something unexpected in the northern survey zone: a Grid installation that is not on any licensed routing chart. It is maintaining a current that runs directly toward the Authority’s primary competitor nation, bypassing their formal trade routes. If the installation is not publicly registered, it is either an infrastructure error - which would be a significant Authority negligence finding - or an undisclosed current that has been providing trade advantages to a specific commercial partner without public knowledge. The Authority’s patrol ship has been seen in the area.