Muspelheim is one of the two primordial realms, the other being Niflheim. Opposite Niflheim, both metaphorically and geographically, Muspelheim is a realm of fire and heat. The sun is made of the stuff of Muspel, as are the stars. Naglfar, “the largest ship” which will fare forth at Ragnarok is in Muspel and it is the “sons of Muspel” that seem to be significant agents of destruction at Ragnarok, not the Jotunar of Jotunheim nor the dead from Helheim, aside from the “champions of Hel” which follow Loki.