A cetus takes a -4 penalty on saving throws against petrification, and even on a successful save against petrification takes 1d4 points of Dexterity damage. If its Dexterity damage from petrification ever exceeds its Dexterity, a cetus becomes petrified. Being targeted with a petrification effect suppresses a cetus's regeneration for 1 minute, even if the creature succeeds at its save.