This includes the ability to use any wizard or priest spell from its scroll form.
In-game description Edit
|“||Use Any Item: Rogues take pride in their ability to adapt and make clever use of whatever is at hand. This ability is an extension of that basic skill. Once learned, the effect is permanent. The ability allows the rogue to use any item, even items that are typically restricted to one class. This allows the rogue to use everything from wands and scrolls to might weapons that none but a warrior could otherwise use.||”|