Wyrmstooth is a fully voiced Skyrim mod that has you travel to an island called Wyrmstooth where you fight a dragon that has a huge bounty placed on it. It even adds spells from Oblivion (such as Ease Burden) at a Mages Guild-type place in one part of the island. It also restores on of the shouts stored in the games' code that was never incorporated into the end product. (Fiik Lo Sah)