Potion of Stone Form

Potions of Stone Form set the armor class of the character to zero and give the imbiber a bonus of +3 to all saving throws, however this will lower dexterity by three points. This potion also has some visual effects, the imbiber looks like he is made out of stone after drinking this. This potion will last for 5 turns. It's not known wheter this can be dispelled. This item appears in Baldur's Gate, Baldur's Gate: Enhanced Edition and Baldur's Gate II.

In Baldur's Gate, this is sold at Sorcerous Sundries.

In-game description
"Drinking this potion is much like the transformation one would go through if she were turned to stone. Skin color, stiffness, even the feeling that is received from the body, stone."