Beast of Nurgle
Beasts of Nurgle are huge, happy, slug-like creatures that slither across the battlefield leaving a trail of slime behind them. They incarnate the Plague Lord's bountiful excitement, and show a friendly nature utterly at odds with the consequences of their presence.
The beasts are propelled forward with undulating ripples and clawed flippers, and include fronds of writhing tentacles that sprout from their blob-like heads and which expel vomit-inducing gasses, clouds of flies and deadly fluids; these poisonous tentacles they use to hug and wrap the playmates they find in battles, unwittingly causing their deaths. Once their "friend" lies inert, the Beast searches for a new one to play with.