Less than a mile away, high in the mountains, lay an unfrozen lake that was fed by a few mountain streams. The lake began to ripple from a volcanic tremor beneath the surface of the lake. Then, bubbles. The lake seemed to boil as tons of carbon dioxide were released from the ground. The gas shot up out of the lake and immediately began rushing down the mountainside like a river.

A centaur was walking through the woods when he heard the rumble. Ground shakes were common on the island, and he felt no need to worry. Then he turned to see what looked like a fog shooting out from the darkness of the trees. The gaseous river smashed into him, taking him with it. He wanted to cry out, but the carbon dioxide asphyxiated him, taking away the breath to do it. The centaur turned purple from lack of oxygen and then finally suffocated. And the river continued on.