They are either very helpful or they do mischief and cause mishap. You cannot trust a Shefro. Shefro like the dark hours and shy away from sunlight. Shefros make their homes in clefts of rock, caves, and mounds of earth. When a human comes too close or is too curious about a location, they gather all their treasures and swiftly leave in a cloud of dust.
Fairies have great treasure.
Their chambers are filled with splendor and magical music fills every nook and cranny. Their music is at the same time simple and enrapturing. In many ways it resembles nature's sound and it seems to envelop you in joy. If you should ever hear this enchanting music, enjoy but do not investigate. Many an Irishman has been lost to the lure of the fairy music.