Hyphothesis: Char is the home planet of zerg right? and char is a very hot and humid planet due to many volcanoes and more.... then zergs mutate or adapt due to the igh heat of the palnet...and their dna assemblance or formation plus the power of the queen.... they leave in hot... then 2 things that can kill them is expose to very high coldness or very low temperature.... strike the zergs planet with coldness or make a weapon that is very cold....

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yeah.. starcraft 2 rocks... it would be nicer if I ca put my customized character.. hehehehe