Plaguestrangler has not washed since he was twelve years old and as such has attracted a rather nasty smell over the last few centuries. The stench is so bad that it can knock out opponents if Vilestench gets close enough.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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All enemy models in base contact with Plaguestrangler must pass a Toughness test at the start of each round of close combat. If failed, they may not attack this round. This has no effect on models with the Animated Construct or Daemonic special rules.