One of the best parts of Daggerfall was how creepy the dungeons were. Some of its more gruesome assets/torture devices could be useful for various locations.
From Daggerfall. Needs a more creative design rather than just "naked woman".... magic leaf underwear or something would be an improvement (see second image), but the details are up to the concept artist.
Has a fatigue draining attack. Resists paralysis and poisons, and can only be damaged by silver and/or magical weapons.
From Daggerfall. Likely found in both High Rock and Skyrim.
Ingredient: Big Tooth (or some variant thereof: 'Big Tiger Tooth', 'Sabertooth', etc. the item never actually existed in-game, but the icon was in Daggerfall's files) 'Resist Magicka' would be one of its spell effects
From Shadowkey. Harder to kill than wormmouths on average. These are also called "Fanged Gouti", but that name was not used outside the game files, so it is not clear what the real name is.
Would have two other kinds in addition to regular one:
Savage Bounder (green; tougher)
Clawrunner (pale pink; toughest, about as bad as vanilla kagouti)