Mimir

Keeper of the well of wisdom under the tree, in which Odin's eye is pledged and from which Mimir drinks each morning; at Ragnarok Odin takes counsel from "the head of Mim", and the Sigrdrifumol says the head spoke "words of truth". The poems never say what kind of being he is; this object files him among the giants, as the tradition does, and says so.