[Astromancer]

I skipped over water, I danced over sea

The wizards have discovered a new way to cover vast areas of space quickly. They're a little weak on accuracy as of yet. Basically, you get a group of people to dance together. The patterns of the dance control your distance traveled and your destination. The charm is cast by a mage playing a musical instrument. They say these new fangled fiddles and guitars work best.

If we could get the flaws in the system worked out we could trade with the golden Indies or far Cathay. Even Chipangu with its golden roofs.

Yes sire, we could also attack your neighbors by surprise and conquer them.

Basically, into a fairly normal fantasy world comes a new cheaper means of teleportation. Quick, efficient, capable of transporting armies easily, and, at present, highly fallible.

Wizards are hiring adventurers, including their apprentices, to work out the problems of accuracy inherent in this spell.

It's a chance to travel to far lands. Which far lands is random at this point, as is getting home.

Note: The astute observer would figure out what kind of all enveloping chaos this kind of travel could bring. There would be many people who'd do what they could to stop the whole thing. Or steal all the secrets for themselves.