White pudding

These cold-loving creatures are likely to be mistaken for ice and snow even under the best of conditions. White puddings haunt polar regions or icy places in order to find prey, although they can live by devouring any animal or vegetable matter; even ice provides them with enough nutrition to exist. White puddings cannot affect metals but dissolve animal and vegetable materials in mere moments, inflicting damage to flesh at an astonishing rate.

Note: The white pudding originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.