Psotnik is an

elf An elf () is a type of humanoid supernatural being in Germanic mythology and folklore. Elves appear especially in North Germanic mythology. They are subsequently mentioned in Snorri Sturluson's Icelandic Prose Edda. He distinguishes "ligh ...

, "mischief maker", in Polish mythology. It comes from the Polish word "psot", which means "mischief". Other translations of psotnik are "prankster," "jester," and "small soft-bodied insect with chewing mouthparts and either no wings or two pairs".Psotnik
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References

Slavic legendary creatures {{europe-myth-stub