I am not exactly sure what you mean by "NE", If you mean the golden egyptian looking part of it, it was removed as i was reworking how the area progresses into the later game, if you could clarify I would be able to help you in a better way.
Edit: I understand what you meant, yeah, the area is currently not accessible, although you could technically unlock the entrance into the "pyramid" you would not be able to progress. I plan on expanding it in a near-future expansion to the game.
Edit 2: [Spoiler for Solution]
- Although there is no point to it, the Wyvern key can be used in the first town of the game, inside of the cave at the wyvern statue. Although it currently has no use, it will unlock the gates blocking the NE entrance in the underwater area.