Ventus and hot air charms don't seem to elicit any reaction from the shell, which lies silent and still as they run their tests. All they manage to do is dry the little guy out, and it grows harder the more they do it. It's only when one of them blows on it that something happens—a thin layer of green moss covers the area where their damn breath touched the shell. It's scant and it wipes away easily, but it grows back if they blow on it again.

Running the shell under water or dipping it in the lake gives them similar results to Freya's tests, giving the shell a slimy, mossy covering. Exposing it to fire, on the other hand, turns it back to the state in which they found it: black and hard as stone.