In a comparison of the east and west coasts of Africa, the book mentioned that prevailing winds are southern on the west African coast. Until improved ship designs in the 15th century, ships could sail down the coast of Africa, but they could not sail back!
It must have sucked figuring that out. If you went south too far in a medieval ship, you’d probably never get home. You might try to land and walk back home, but good luck crossing the Sahara Desert.D&D ships are probably of medieval design, and it is quite possible that, as in the real world, there may be one-way journeys for D&D ships. Here’s a natural way to impose the same kind of walls and one-way doors on the campaign map that exist in the dungeon.
Imagine the easternmost continent of a campaign world has a prevailing easterly wind along its deadly southern coast. Once you go too far, it’s impossible to sail back to the known world. Let’s say that there’s a tempting ruin right on the edge of the point of no return. Getting there requires a ship-based skill challenge. Success means that the PCs get to the ruin. Failure means that the PCs’ ship is caught in the current/prevailing wind and has no way of getting home except by circumnavigating the globe, which will take a year or more. Here is a skill challenge with major consequences for failure! Failing the challenge would change the nature of the campaign, potentially for many game sessions, into a ship-based Odyssey campaign. Failure in this case might be much more interesting than success.
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