Source: Warhammer Armies Project: Unofficial 9th Edition

Master of Ballistics
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One war machine that is within 3" of a Master Engineer can use his Ballistic Skill or re-roll one artillery dice or scatter dice during each Shooting phase. This cannot be the artillery dice that determines the distance a cannonball bounces. You must nominate which weapon, if any, will be using this special rule at the start of each Shooting phase, before any such weapons within 3" of the Master Engineer are fired.

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