Nasty Skulkers often make use of special puffball mushrooms to create a cloud of smoke they can disappear in when the fighting is not going their way.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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At the end of any Close Combat phase in which a unit of Nasty Skulkers take part, they may choose to use their smoke bombs. On a 4+, the unit may disengage the combat by making a flee move. If they do so, the enemy cannot pursue them and they will rally automatically in their next turn.