Skyrim Immersive Creatures
Skyrim is a big game but it has its limits. If you've played the game for hundreds of hours, there's a good chance you've fought every enemy in the game. Close to it at least. If Skyrim Immersive Creatures is released for console, it'll take you a lot longer to encounter that problem.
This mod brings a ton of new enemies and creatures into Skyrim's world. You can take a look at the additions right here. They're stunning and they fit right in with all of the other things trying to kill you in Bethesda's game.
The mod also comes with a MCM (Mod Configuration Menu) that allows you to play around with some of its settings.