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Mr. Wotan was one of the first terrans to return to Braxis after it was glassed by the protoss. He reported that most of the planet's surface had vaporized, but had not necessarily disapeared. This was an accurate prediction as the water vapor in the sky condensed into snow and hail, raining down on the planet and transforming it.
"Wotan" is a synonym for Odin, a Norse god.