On the way to Arendell, out of nowhere, appeared an iceberg. The height of the iceberg was about 30 meters; it had a bluish color and some sort of energy. The grass and trees nearby had been frozen, and there were some ice-bound statues, including the masked man who had since lost their life.
Almost no one else dared to approach it, and even an idiot knew that something dangerous must have happened.
The iceberg stood for quite some time.
And traces of cold spread to the surroundings, causing the temperature to drop drastically.