The target of prevarications bounty receives a Fortitude save to resist the spell, otherwise the subject is cursed such that any intentional lie he speaks has the immediate effect of grotesquely swelling his tongue until it bulges his cheeks and issues forth from his mouth buy a few inches. Liars so afflicted cannot speak coherently, so they cannot cast spells with verbal components or pronounce command words. Neither can they eat or drink properly. The swelling will receded in 2d4 minutes provided the victim oes not continue to prevaricate.
The curse cannot be dispelled, but it can be removed with a break enchantment, limited wish, miracle, remove curse, or wish spell. For remove curse to be effective, the caster must be of equal or higher level than the caster of prevarication's bounty.