Writer's Block: What's under Snape's cape?

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Which teen-ager or teacher would I molest? Seriously?

ETA: Looks like someone realized a groping Harry Potter character question was bad and changed it. So type of spell? Abjuration is a type of spell. And its got most of the boom spells. Or Conjuration. Plenty of boom there. Really I'd pick a type that let me destroy things for annoying me...