Potion of Petrification

Potion of Petrification is a consumable that protects the player from physical attacks and all spells, but makes the player unable to perform any action.

Previously known as the Flask of Petrification, several quests and items still refer to it by that name. However, it shares none of the current characteristics of a Flask.

Source
Potion of Petrification is created by Alchemists with a skill level of 300; taught by Recipe: Potion of Petrification.

As a quest objective

 * Craftsman's Writ - Potion of Petrification (quest)