YGGDRASIL The World Tree, which in Norse mthyos had its upper roots in Asgard, its lower in Hel, and its third in Niflheim. The gods met beneath its branches in council everyday, and around its base Niddhogg the dragon gnawed at its roots, while the squirrelRatatosk ran from top to bottom of the Tree, bringing news and insults from Nidhoggto the great eagle that dwelt in Yggdrasil's topmost branches. The well of Mimir wasat the base of the World Tree.