lidércfény

Noun

 * 1) will o' the wisp, ignis fatuus an atmospheric ghost light seen by travelers at night, especially over bogs, swamps or marshes
 * 2)  ghost according to superstitious beliefs, a vagrant evil spirit that roams in the shape of fire
 * 3)  will o' the wisp an attractive but dangerous and misleading phenomenon or thing that one feels compelled to pursue