Deadly Dungeons
https://www.nexusmods.com/daggerfalluni ... escription
This little mod adds additional enemy spawns on the game's dungeons. You can tweak the chance and number of additional enemies that can spawn.
Beware, the difficulty can ramp up significantly!
In the future, I'd like to try to also have the option of introducing enemy variants, with altered stats but for now it's just extra enemies.