According to the in-game book, A Herbalist’s Guide to Skyrim: Infused with dark magic, their bodies transformed into twisted monstrosities complete with feathers and bird-like claws. These nasty witches are a grotesque cross between old crones and monstrous birds. Some of the more dangerous foes you’ll encounter in Skyrim are Hagravens. The snowcapped mountains and towering pines would look pretty enough, but you can’t test your mettle against scenery - gamers everywhere need to improve their fighting prowess by going up against dangerous foes. Just imagine how boring it would be if you didn’t run across wolves, bears, or giant Frostbite Spiders as you traversed the wilds of Skyrim. Combat with nasty beasties not only adds interest to the game, but is the basis for improving fighting and defensive skills.
One of the many things that makes Skyrim so amazing are the sheer number of monsters to fight.