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Just curious. Aside from the obvious savings in mana, why use rank 1 Frostbolt? Wouldn't it be better to simply use the highest rank of frostbolt available?
The other reason, would be that its casting time is much quicker than high ranking ones. For example: when you get the talent to reduce casting time on frostbolt, (Frostbolt Rank 1) would only take 1 second, (may be wrong on the actual casting time)