Source: Warhammer Armies Project: Unofficial 9th Edition

Unholy Strike
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Ability5 points

The champion can channel the dark strength flowing through his veins to deliver a single blow that can shatter a fortress wall.

Instead of attacking normally, the character can choose to make a single special Attack. If they do so, and the Attack hits, the hit is resolved at double the character's Strength
and has the Multiple Wounds (D3) special rule.