The material below is Open Game Content from a 3PP Source
Cockatrice Strike (Combat)
With a single strike, you transmute flesh to stone.
Prerequisites: Improved Unarmed Strike, Gorgons Fist, Medusas Wrath, base attack bonus +16.
Benefit: As a full-round action, you can make a single unarmed strike against a dazed, flat-footed, paralyzed, staggered, stunned, or unconscious foe. If that attack is a critical hit, the target is petrified unless it succeeds on a Fortitude saving throw with a DC of 10 + 1/2 your character level + your Wisdom modifier. This is a supernatural polymorph effect.