So Slavic mythology isn't exactly my strong suit. In fact this is in all honesty something I only know because of insomnia fueled Wikipedia rabbit holes but at any rate..... isn't this the one you carve a little wooden doll for? Make it look cool and then you can trap it in it?

At this point it likely wants the leshy(Consider that it might already have him partially. He was oddly forward with giving his name especially considering that he was just arguing with that one bitch about stealing your name)...... anyway carve a little leshy doll and see what happens?