You are just finishing your midday meal while listening to a blacksmith tell about being awakened last night by a loud crash. According to the smith, a crystalline vine burst out of the ground and punched a hole through the roof of his neighbor's bakery. "Must be divine punishment for the bad pies and steep prices," says the blacksmith with a nervous chuckle. Suddenly, the earth shakes violently beneath your feet. You hear the dull roar of a distant eruption. The smith and several others hurry outside. Joining them, you see a sinuous, crystalline vine erupting from the ground a few blocks awayβtall enough to be seen above the rooftops. Screams of panic rise from the same direction.

The ground churns again, and more eruptions burst through the streets all around you. From these sites sprout smaller crystalline vines that uproot themselves and begin lurching through the streets, driving panicked citizens before them, while the enormous vine in the distance stretches ever taller.
What do you do?