Here There Be Monsters - Call of Cthulhu mod for Elder Scrolls V: Skyrim

This quest will plunge you into the depths of Lovecraftian horror that were only hinted at in the Dragonborn DLC, pitting you against giant monsters not from the sea, but from the stars. This is a direct sequel to "Here There Be Monsters", and as such will require both mods. After you finish the original two quests, (and walk into one of the coastal taverns to trigger the quest,) you will receive a letter that will set in motion a new chain of events that will pit you against the Great Old Ones. This quest will assume you have completed both the main quest and Dragonborn, since it is a bit of a sequel to the Miraak story as well. (However, this is not technically required; I realize some people may have multiple characters that have not finished the main quest. Just realize that the dialogue/story assumes you have beaten both Alduin and Miraak.) Consider this a sort of endgame quest; I cannot guarantee that all NPCs will survive, especially if you choose to join Cthulhu.