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Fenris Isle is a large island located in the center of Lordamere Lake and it is generally considered to be a part of Silverpine Forest. Together with the Dawning Isles, they form a broken circle of dry land in the lake.
When the undead Scourge took the land, Fenris Isle was abandoned, all of its inhabitants either fled or were murdered. The island was then occupied by the Rot Hide gnolls, who took the keep as their base of operations. The Rot Hides were led by their treacherous master, Thule Ravenclaw, who took complete control of the island and the nearby Decrepit Ferry. They were eventually defeated.
Some time later, the island was taken over by Hillsbrad Refugees who had made their way here from ruined Southshore and Hillsbrad Fields. These survivors of the Forsaken attacks would live in peace but for a moment, as agents of the Forsaken along with Agatha entered the island and began killing them and raising them into the undead. Darius Crowley made them an offer they couldn't refuse, either die and join the ranks of the undead, or drink his blood and become worgen and continue to fight for the Alliance. They chose vengeance and became Hillsbrad Worgen.
At some point, the keep and isle were over taken by Deathstalker Hayward, who was later defeated by the Bloodfang Pack reclaming the area for themselves in the process. During the evacuation of the Undercity during the Battle for Lordaeron, the Bloodfang were distracted by Horde forces, while Forsaken refugees escaped across Lordamere Lake.
In the RPG
Lordamere Lake contains an island called Fenris Isle on which once held a great fortress known as Fenris Keep, but the structure has sunk into the bog and is now mostly submerged and covered with mud and scum.
- Fenris Keep and Fenris Isle are likely a reference to Fenrisulfr Fenrir, the horrific wolf who was the brother of the world serpent and the goddess of hell. Fenrir was bound by the Norse gods on a remote island in a massive lake inaccessible to mortals or giants. He is the eternal foe of Odin the Allfather.
- Fenris Isle may be what's left of Cross Island. Some parts of the island have seemingly sunk.
- One Arcane Observatory might have possibly been found on the isle.
- This formation might have been once the rip of an ancient volcano, long since eroded down by the elements.