Source: Warhammer Fantasy: 8th Edition

Accusation
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After deployment, but before the first turn begins, select a single model in your opponent’s army. This is the Witch Hunter’s primary quarry. The Witch Hunter may re-roll all failed To Hit rolls against his primary quarry. Every hit he inflicts on that model also has the Killing Blow special rule, even if they were from a shooting attack. The Witch Hunter may also choose to shoot at the primary quarry as if he had the Sniper special rule.

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