Dreughs are a race that has long been established in The Elder Scrolls lore, an aquatic race of octopus or crustacean-like beastfolk that according to legend may once have even ruled the world as tyrant overlords with a version of Molag Bal serving as their chieftain.  Regardless of the truth or lackthereof in these myths, Dreughs today have been reduced to lower-intelligence beings with little to no civilization of their own, surviving as dangerous scavengers known to attack and kill the other races of Tamriel for food, territory, or to defend their clutches of eggs, which can often be found within watery caves or secluded ponds and lakes.  They are known to domesticate crabs as cattle or defenders of their nests, and to steal the fish from the nets of fisherman.

They come in many variations that can change throughout their life cycle, ranging from underwater Dreugh more akin to squids or octopi to land Dreugh with hardened Chitin carapaces that, along with their wax and eggs, have been harvested by civilized races for use in crafting.  The most terrifying variant of these creatures you'll find in Skyrim is the Brood Queen, a gigantic Dreugh flanked by oversized mudcrabs known to call smaller Dreughs to serve her and defend her nest.  They dislike the cold, and thus are mainly found in the southern, more temperate areas of Skyrim, or deep within the depths of sunken caves and ruins, though there have been sightings of Dreughs on Solstheim that, following the Red Year and the ashfall that followed, have adapted to their surroundings and perhaps have even been altered over time by the mysterious heartstones that have scattered across the island...Dreugh are known to be able to produce massive amounts of electricity from their bodies, which scholars believe to be natural as opposed to magical.  The Ash Dreughs of Solstheim, however, seem to have adapted to be able to produce flames and heat to ward off their foes.