A while back I was asked to share my understanding of Níðhöggr by a fellow Heathen. Vikings of Bjornstad lists the meaning for Níðhöggr’s name as ‘Malice Striker’. The first section of the compound name, níð, is related to malice, insult, and strife. The second is related to beheading, striking, blows, or chops. Not much survives on this dragon/serpent survives from the lore. Among the places to look for Níðhöggr are in the Prose Edda, both in Gylfaginning and Skaldskarpamal, and in the Poetic Edda Grimnismal and the Voluspa. While the lore refers to Níðhöggr as male, my interactions with Níðhöggr have leant me to understanding the dragon as female.
I relate to Her as a God of Rot and Death, and a God of the Gravemound as well, especially seeing interlinks between the rotting of death and the eating of poison. My family’s compost heap is dedicated to Hela and to Níðhöggr, as we see Níðhögg as eating the poison of Yggdrasil and the making of it into the healthy new earth that is renewed. The gravemound takes in the Dead and the new growth results within it, holding the power of the sacred items deposited within it and the new growth above.
Most of my understanding and beliefs regarding Níðhöggr is from direct experience of seeing Her and interacting with Her. When I was saw Her, She was chewing the corpses of the Dead, taking the poison of Their lives, Their misdeeds. She does the same with the root of Yggdrasil She chews on, not to damage it, but to prevent poison that is collected in Helheim and the Nastrond from killing It.
A powerful insight of dragon symbolism, at least in terms of how I see it in Norse/Germanic/Scandinavian culture/myth is that part of their destructive nature is what they sit on. In Fafnir’s case it is his bed of gold and the greed associated with it. In Níðhöggr’s case She is lying in the midst of traitors, oathbreakers, and is sitting with the rot and poison of Yggdrasil’s root. She chews on the traitors, oathbreakers, and outlaws, as well as the root of Yggdrasil. One of the passages in the Voluspa says She sucks the blood of the slain. I see Her doing similar, chewing and sucking on the poison in the root of Yggdrasil, removing the rot so it stays healthy. It also explains why Her/His hall is the Hall of Serpents dripping poison because that is Níðhöggr’s environment. My fellow Heathen likened it to a poison dart frog, and I think that’s a fair reading of Her too.
It is telling that the only time She emerges in myth is during Ragnarok and She isn’t destroyed, but takes up roost again beneath the ground. I find Her very purifying, as She has been in the midst of all that rot, poison, and uncleanliness, and yet, She has not lost Herself to it. She engages with this Work before and after Ragnarok. She is rejuvenating and dangerous, the Chewer of Corpses and Warder against Poison. As outlaws and traitors were among the worst one could be, and both were put into the utgard of society, I see Her as a boundary-keeper since She gives these dangerous and vile Dead a place to go to be contained, chewed, composted so they do not harm the community or rest of Yggrasil. She is the God that chews the rot beneath the Tree, rejuvenating both the root and the soil in which Yggdrasil’s root rest; necessary and holy.