Some sovereigns prefer a different sort of tax from their subjects - whether freely given, or taken by force.
The PCs are accosted in a major city containing at least one famous fortuneteller / prophet of the future. They are informed that their as-yet-unborn child will (insert terrible evil), and that, although they are very sorry, the PC must be executed to keep this from happening.
1xp
Hailing from the giant swamp planet of Acadia, the Leech Lords rule with a mighty will. And slimy green tentacles.