Mímir stands guardian over Mímisbrunnr, the well of wisdom pooling beneath Yggdrasil's root, and drinks from its waters each morning through the horn Gjallarhorn.
⚠ Gylfaginning 15 assigns Gjallarhorn to Mímir for drinking from the well, but Völuspá 46 associates Gjallarhorn with Heimdallr. Scholars debate whether these are the same artifact.
Odin sacrificed one of his eyes for a single drink from Mímisbrunnr, gaining cosmic wisdom. His eye remains hidden in the well, as told in the Völuspá.
Yggdrasil's second root extends to Mímisbrunnr, the well of wisdom in the realm of the frost giants. Odin sacrificed an eye for a drink from this well, as told in the Völuspá.
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