The Werewolf Fenrir greyback a reference to Fenrir the Wolf
Nurmengard- Gards were traditionally fortresses in Norse Mythology (Asgard, Midgard)
Also a more in-depth look at the end of the series appears very similar to me to Ragnarok Norse end of days The death of the father (Odin, Dumbeldore) at the hands of the wolf Fenrir (the wolf, greyback) who crossed the magical (Bifrost Bridge, cabinets) to the great castle (Asgard, Hogwarts) which causes the son (Thor, Harry) the (god of, boy with .... shaped scar) lightning to defend the weaker beings (Humans, Muggles) from the great Serpent (Midgard serpent, Voldemort (connected multiple times with snakes)) but he dies in the process, as the world (Midgard, Hogwarts) burns a new world order emerges from the wrecks of the old after the defeat of the great serpent