Nidhogg (or Níðhöggr) is a fearsome dragon or serpent from Norse mythology that gnaws the roots of the world tree, Yggdrasil, symbolizing cosmic destruction, while also feeding on corpses in Niflheim; the name means "Hate-Striker" or "Corpse-Tearer," and it's a key figure in the lead-up to Ragnarök, interacting with an eagle and the squirrel Ratatoskr via insults. The name also refers to a popular, fast-paced indie video game about fencing and tug-of-war, famous for its intense competitive multiplayer.