Well, a staff tends to help. Maybe a lyrium potion here and there.

[ But, of course, neither is strictly necessary. They're tools to aid in casting, but only that.

He lifts a shoulder again in a halfhearted shrug, setting the lantern down in the middle of the desk and shuffling aside a sheaf of papers. ]

If you're asking whether I was born with it or simply lucked into an incredible talent for slight of hand, though, it's the former.