Norns: female beings who rule the destiny of gods and men. Sturluson’s interpretation of the Völuspá, the 3 most important norns, Urðr (Wyrd), Verðandi and Skuld come out from a hall standing at the Well of Urðr (well of fate) and they draw water from the well and take sand that lies around it, which they pour over Yggdrasill so that its branches will not rot. These norns are described as three powerful maiden giantesses (Jotuns) whose arrival from Jötunheimr ended the golden age of the gods.
Yggdrasil... the Norse Ash-tree of existence, has its roots deep-down in the kingdoms of Hel, or Death: its trunk reaches up heaven-high, spreads its boughs over the whole Universe: it is the Tree of Existence. At the foot of it, in the Death-Kingdom, sit the three Norns, Fates--the Past, Present and Future; watering its roots from the Sacred Well.