Mimir

Mímir (Old Norse "The rememberer, the wise one") or Mimir is a figure in Norse mythology, renowned for his

knowledge and wisdom, who is beheaded during the Æsir-Vanir War. Afterward, the god Odin carries around Mímir's head and it recites secret knowledge and counsel to him. After the Calamity Odin permitted Mimir to have a body again and created one from the branches of Yggdrasil to act as his neutral party on Earth. Mimir is unable to lie and can sense when others are telling him the truth.