Elden Grove, Eldengrove, or the Grove of the Sage is an ancient and mystical forest located deep within the province of Valenwood. The Elden Grove is the home of the First Tree, which gave life to the land, creating the forests of Valenwood and Tamriel.
The Elden Grove's location is largely unknown, though it is believed to be located in western Valenwood. The innards of the Elden Grove are described in myth with a misty and labyrinth-esque landscape. The First Tree itself is confused with Elden Root, which is a Graht-oak on the other side of the province. The vast forests are not easy to traverse, requiring several lights to see. Traveling further down the dungeon will eventually take you to the inner ruins of the area, filled with water canals that are necessary to use, to reach the inner sanctum. On the northwestern hall is the deepest part of the dungeon, filled with water. In some instances, the term "Elden Grove" has been used as a greater region, since city-states such as Silvenar and Greenheart are known to be located in this area.[OOG 1]
During the Imperial Simulacrum from 3E 389 to 3E 399, Emperor Uriel Septim VII was imprisoned along with Talin Warhaft in the Deadlands by Jagar Tharn. Tharn planned for months to capture the throne, and he was able to achieve so in the span of ten years. Tharn had a powerful weapon called the Staff of Chaos, and he split it into nine pieces and scattered them across Tamriel, the staff was the only thing keeping Uriel Septim and Warhaft in Oblivion. A warrior escaped his clutches and traveled all corners of Tamriel to retrieve the missing pieces. The hero was known as the Eternal Champion, and he assembled the staff and defeated Jagar Tharn at the Imperial Palace. The Eternal Champion had at one point visited the forest of the Elden Grove in their quest to recover the pieces.
The Eternal Champion had retrieved the third piece of the staff from the ruins of the Labyrinthian, continuing their quest throughout Tamriel. In their sleep, Ria Silmane came to the warrior through a dream, telling them where the next piece is, which was the forest of the Elden Grove in Valenwood. The Champion had then traveled to the city-state of Elden Root, to get an idea on the Elden Grove's location, and was directed to Queen Ulandra, the queen of Elden Root. Before they were given the whereabouts of the Elden Grove, the queen gave the Champion a proposition, if they defeated Selene from her fortress in Selene's Web; then she will give them what they need. And so, the Champion was able to get the coordinates for the Labyrinthian and retrieve the third piece of the Staff of Chaos. The Champion would then set their sites for the province of Elsweyr.