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

Harmony
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Grand Cathay's units are divided into two categories, Yin and Yang. When a Yin unit is within 3" of non-fleeing Yang units with a combined Unit Strength 10 or more, they may re-roll 1's To Hit with missile weapons. When a Yang unit is within 3" of non-fleeing Yin units with a combined Unit Strength 10 or more, the Yang unit may re-roll 1's To Wound in close combat.

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