I like to use X-Ray so i can start combats from around the corner, getting some destruction or protection before the mobs even know i'm there. Any of the ball spells, like Noxious Fumes, Quicksand, Death Cloud, etc. can be used on opponents you can't see (before they have a chance to put up Eye-4-Eye), and you can also start combat within a short distance of visual contact, if you're around a corner or behind something, and get your Haste or Soul Shield (etc) going as you step out to engage.
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