Beasts of Nurgle

From HammerWiki

The Beast of Nurgle is a truly horrendous aberration. It has the soft, sticky and mottled body of a pallid slug and a face of writhing green tentacles. The Beast of Nurgle is no less deadly than it is ugly, for its touch causes paralysis and its slimy secretions rot everything they cover. With a high toughness, multiple wounds and the ability to regenerate, they are pretty much immune to the attacks of anything not wielding a great weapon or lance.