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

Zephyrspites
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These buzzing insectile symbiotes can be released to confound the attacks of the foe for a short time as their masters sprint off to find safety anew.

After a unit where the majority of the models with this special rule has resolved all their missile attacks and is within 6" of an enemy unit; they may move directly backwards D6", keeping the same unit facing.

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