Jötnar, plural of jötunn–giants.
It may surprise folks who have only come to know me as an adult, but I was a very small child. Not only the shortest boy in my class, but the third shortest child in my grade (this was hammered home every year when we were arranged by height for school photos). If you consider a short, bookish boy in a small town, one who read about mythology instead of playing hockey, it also won’t surprise you that in a world where it felt like everyone was bigger than me, I identified giants as my boogieman monster of choice over vampires or werewolves (I wanted a dragon, and zombies weren’t a thing then).
The giants of Norse mythology are often brutish, and yes, violent, but they are far more than that. In Norse myth, our entire world was made from the bones and blood of the first jötunn, Ymir. Many jötunn, Loki included, have a gift for changing their shapes. Two such giants, chased after the sun and moon in the guise of wolves, fated to gobble them up at Ragnarök. Jötnar also found their way into the pantheon of gods (or at least into the beds of the gods).
They were seers and secret keepers. The Norns, who tended mortals’ threads of fate, were said to have jötunn blood. Odin traded an eye to drink from the well of Mimir to gain great wisdom (to which it must be remarked: wouldn’t it have been wiser to not rip out your own eye?). Even after Odin traded an eye for knowledge and hanged himself from the World Tree to gain mastery of rune magic, he still consulted jötunn seers from time to time.
Jötnar were also masters of illusion and trickery. One of my favourite stories of jötunn mischief is the story of Útgarða-Loki (or Loki of the Outyards, not to be confused with Loki-Loki) who managed to trick Thor into trying to drink the ocean, and even pulled the wool over his namesake’s eyes, matching the trickster god against fire personified in an eating contest.
Speaking of fire–and fire giants–there is Surtur who is destined to engulf the world in flames–and to pop up in Thunder Road*–but you’ll have to wait a few days to read about him.
*No spoilers, this is revealed on the back cover copy.