Creating a Mod that lets you join the Thalmor, and in theory even end up leading the Thalmor is very possible, and a pretty cool idea. I would be tempted to look into it myself, although I can't promise anything, because I'm not the best or quickest at writing script. My breakdown of the idea would be similar to the current guilds available, but I would break the guild route into sections: --Become a Thalmor Informant - do mini quests that get information to the thalmor --Become a Thalmor "Peace Keeper" - Get placed on assignment with the Thalmor --Become a Thalmor operative - You become a Thalmor Assassin, and are given quests to kill several of the Jarls --Become Head of the Thalmor - You kill the head of the thalmor in his sleep, and are placed in charge of the thalmor. It'd be something like that, obviously with lots of quests filling it out. It's pretty simple to do something like that, so i might have a look into it, keep an eye out.