Ideas for an end-game content mod?

[doctorMe]

Skyrim's CRAFTABLE OBVLION PORTALS

 

The mod would allow you to craft crystals with a difficult recipe, which when used will create a portal to a Oblivion realm. The dungeon generated is small, randomly generated and is set outside, making it the perfect end game material for the game. When used, the crystal disappears and you have to make a new one.