Final answer:
In fiction, a petrification spell is typically reversed using a counter-spell, potion, or magical object, or by fulfilling a special condition or quest. The specific cure depends on the fictional universe's established rules.
Step-by-step explanation:
The question asks about reversing a petrification spell. In the realm of fantasy and fiction, particularly in literature or role-playing games, spells can sometimes be undone by various means. To undo a petrification spell, one might need a counter-spell, a potion, or a magical object with restorative properties. In some stories, the petrification can be reversed by fulfilling a condition or quest, like finding a rare herb or receiving a blessing from a powerful being. There are also narratives where the effects are irreversible, adding a layer of tragedy or permanence to the storyline. These solutions are entirely dependent on the rules established within the fictional universe in which the petrification has occurred.