Formed from the putrid vapors of a stagnant pond, its filthy sickle cleaves enemies with a frightening speed. They appear in groups, laughing wickedly.
As these are the first enemies in the game, just use a physical attack, and they'll go down easily.
There are numerous local variations of the creature - a common motif is that it is a weasel-like creature with elongated sickle-like nails. Some variants have them appear in groups of three, and living in ponds or rivers.