A cockatrice's bite causes flesh to calcify and harden-multiple bites can cause a living creature to fossilize into stone. Each time a creature is damaged by a cockatrice's bite attack, it must succeed on a DC 12 Fortitude save or take 1d4 points of Dexterity damage as its flesh and bones stiffen and harden. (This slow petrification does not alter a bitten creature's natural armor.) A creature that is reduced to 0 Dexterity by a cockatrice's bites immediately turns completely to stone, as if petrified by a flesh to stone spell. Every day, a creature petrified by a cockatrice in this manner can attempt a new DC 12 Fortitude save to recover from the petrification, at which point the victim returns to flesh with 1 Dexterity (and thereafter can be restored to full Dexterity by natural healing or magic as normal)-but after a petrified creature fails three of these Fortitude saves in a row, the petrified state becomes permanent. A creature restored to flesh via magic has its Dexterity damage caused by cockatrice bites removed, but not any existing Dexterity damage from other sources.