The raw energy of magic can be immensely powerful, but it is highly unstable and can be as dangerous to the wielder as it is to the foe.
Source: Warhammer Fantasy: 7th Edition
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Signature SpellCasting Value: 4+
If Power of Darkness is successfully cast, the wizard immediately gains D3 + 1 extra power dice. These dice are added to those available to the sorceress, but keep them separate or use different-coloured dice. These additional dice cannot be used to dispel spells in play or be stored from turn-to-turn in any way possible. For each of these dice still unused at the end of the Magic phase, the sorceress suffers a Strength 4 hit.