One use only. A Dispel Scroll is inscribed with a powerful anti-magical invocation. When it is read out by a Wizard, the effect is to drain away magical power and weaken a spell that has been cast. As soon as a spell has been cast, any Wizard who has a Dispel Scroll can read it instead of attempting to dispel the spell by using dispel dice. This automatically dispels the enemy spell; no dice roll is required.

Note that even a Dispel Scroll will not help if the spell has been cast with irresistible force. Note also that Dispel Scrolls cannot be used to dispel spells that remain in play other than at the moment they are cast.