Thanks for the feedback! With your suggestion in mind, would you recommend dropping the possibility that the PCs might turn to stone as well? I was trying to instill some urgency in resolving the situation, but I'm cognizant of the dangers in trying to force a party to stay put. (In my experience, parties prefer to do the opposite of whatever a GM thinks they're going to do...)
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If I was running this for my group, I would turn that 1 in 6 chance of complete stone to just 1 hand or foot turns to stone: A stone hand is a penalty in combat and makes two-handed manipulations impossible. A stone leg makes movement and dex checks/saves difficult.
Future 1-in-6 failures would spread from the foot/hand up into the arm/leg and incur a greater penalty. That way the character can continue playing with the sense of urgency you are trying to cultivate. But maybe I'm just too soft-hearted, lol.