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

Venom Thicket
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Poisonous creatures abound within. Provided you do not succumb to it first, their venom can be used against the foe.

Any model in a Venom Thicket has the Poisoned Attacks special rule (applies to close combat attacks only). However, any model moving through a Venom Thicket must take a Dangerous Terrain test, to represent their attempt to fend off the venomous critters within.

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