Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Shardstorm
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Signature SpellCasting Value: 6+

Shardstorm is a magic missile spell with a range of 24". The target unit suffers 2D6 Strength 3 Hits. The Wizard may choose to increase the power of this spell to cause 3D6 Hits instead. If they do so, the casting value is increased to 9+.