The mediastinum is the part of the thoracic cavity that contains the lung, the heart and its major blood vessels, the trachea, the thymus gland, and the esophagus. False lungs are located outside of the mediastinum.
Erlendr was a Nord warrior. He is a hero, and his ghost can be found inside the Hall of Valor in Sovngarde. He, along with Nikulas and Hunroor, was turned into a stone pillar at Brodir Grove by the wizard Grimkell while searching for Sovngarde. Ulfgar the Unending later avenged them by killing Grimkell.
The Sword of Summer (mentioned) The Hammer of Thor (mentioned) Ullr (often spelled Ull and Ullinn) is the Norse Aesir god of glory, hunting, and skiing and the son of Sif and step-son of Thor. Ullr was briefly mentioned in The Sword of Summer by Otis, saying Ullr invented snowshoes and archery. He presumably has the standard powers of a god.