Býleistr (Bee-lighting, sometimes anglicised Byleist) is the brother of Loki and Helblindi (All-blind or Hel-blinder) and is the son of Laufey (or Nál) and Fárbauti (Cruel-striker or Dangerous-hitter). Nothing is known about him other than his family and that he, and his brothers Helblindi and Loki, were to lead Hel's army into battle at Ragnarok.