So shall we cut that up and use it as the basis for for Su power?
How's this:
Shatter Bone (Su): Four times a day, a visceraith can try to shatter a limb-bone or jaw-bone of a single opponent within 60 ft. Shatter bone can not affect boneless creatures, but can harm creatures whose skeletons are made of chitin rather than bone, such as most Vermin. The opponent must succeed at a DC X Fortitude save or suffer compound fractures in the targeted bone, which does Y damage and imposed the following penalties: a body part with a shattered bone lacks the Strength to hold and carry objects or make attacks, held items are dropped, but worn items are not dropped; if a shattered limb is used for locomotion (for example, a leg), the target's speed drops by three-quarters and Dexterity suffers a -8 circumstance penalty; if a shattered limb is used for manipulation (for example, an arm), the target's Dexterity suffers a -8 circumstance penalty and all spells with somatic components require a Concentration check (minimum DC 15); a target with a shattered jaw bone suffers a -8 circumstance penalty on skills checks requiring speech and all spells with verbal components require a Concentration check (minimum DC 15).
A shattered bone normally takes Z days to heal naturally (half that time if DC 15 Heal checks are used to provide long-term care), but can be instantly cured with a [cure serious wounds?] or stronger healing spell.
The save DC is Charisma-based.