During the Invasion of the Battlespire, Mehrunes Dagon's forces sealed the Gate with a powerful sigil in the shape of the Daedric letter Hefhed. This left the sorcerers of the Battlespire trapped and without any access to reinforcements.
Sometime later in the Third Era following the defeat of Dagon's forces, the mage Morian Zenas attempted to use the Weir Gate to enter Oblivion. While they discovered the gate still stood and the link to the Battlespire was still accessible from Mundus, its link to Oblivion had been severed.
- An Elder Scrolls Legend: Battlespire
- The Elder Scrolls IV: Oblivion (Mentioned only)
- The Elder Scrolls V: Skyrim (Mentioned only)
- The Elder Scrolls Online (Mentioned only)