Awesome question @wasantha- thanks for bringing it up!
While nymphs and dryads will take on unique qualities in various traditions, here in Poland nymphs are called “Wiła”- which many believe which were originally human girls who were turned into nymphs through various circumstances.
Regardless of how one became a Wiły, the descriptions of them are similar across cultures. They are beautiful young nymphs or fairies with long, often blonde, hair and often translucent or very little clothing. Singing, dancing, and hunting, they flew and rode both horse and stag through the woods to draw in young men. “Black” fairies were maleficent, often considered like the Greek sirens (not to be confused with the Slavic Sirin). Some men fell into their traps and were forced to dance (or be tickled) to death. These nymphs could also deter travelers with their arrows and steal babies, replacing them with changelings.
From Slavic Nymphs
There’s also a video with more information if you have an interest in nymphs as they appear in Slavic mythology!
Slavic nymphs seem to be more along the lines of trickster faeries or sirens- maybe not the kind of creature someone would be interested in working magick with
Perhaps the nymphs and dryads of other traditions are more along the lines of what you are looking for, but hopefully you found a bit about Slavic nymphs to be interesting!
Good luck and blessed be, Wasantha!