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

Warpstorm
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Spell Level 3Casting Value: 10+

Clouds roil overhead angrily discharging greenish-black bolts of warp lightning.

Warpstorm is a direct damage spell that targets all units within 12". Roll a D6 for each unit within range, including units in close combat. On a 4+, enemy units suffer D6 Strength 5 hits with the Lightning Attacks special rule. Friendly units are only affected on a 6.