Source: Warhammer Armies Project: Unofficial 9th Edition

Broken Concentration (Dispel)
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If the total of the natural dice scores is 1 or 2, not only is the spell not dispelled, but the Wizard is so preoccupied by their collapsing dispel that they are unable to dispel spells for the rest of the Magic phase. Note that the army can always attempt to dispel, regardless of previous failures.

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