Ars Magica: Hibernia
Staff of Shaking
Number of Uses: 12 times per day
Effect: Casts the spell: “Wielding the Invisible Sling”. Hurls any nearby object that could normally be thrown by a person at any target within range. The object must not be held down or otherwise restrained. Damage depends on the object thrown, up to +5 for a fist-sized stone. Casting requisites of an appropriate Form for the target are required.