Casts 0.5 seconds faster and lasts 30 seconds longer.
So it has value when you're gathering up a kite with flux staff on mobs who run fast, and also when you take more than 2 min to kill a quad.
Beyond that, no reason. For your run of the mill quad spot I don't believe you'll find any benefit in using the higher one other than to feel cool using higher level spells.
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