“ Sword sharpness is equal to the status and skill of its wielder.”
“ 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.”
“ Perhaps divinations, if strong enough, can actually change the future, instead of predicting it.”