Source: Warhammer Armies Project: Unofficial 9th Edition

Instant Kills
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Some special attacks don't inflict wounds, but require models to be removed as casualties (after failing a Ld or T test, for example). Where this is the case, not only are no saves of any kind allowed (unless specified otherwise), but the number of wounds on the victim's profile is completely irrelevant – just remove the model from play.

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