Thunderstorm is an event found in Spiritfarer.
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Atul will go to a location near-ish to Stella and will start to play his flute, then small circles of lightning will appear around Stella. The lightning within the circle will grow with time. When you go into the circle, the lightning will come down and Stella will hold a bottle to the sky, and you get Glim and often Lightning in a Bottle.