Deterioration is a full conversion for Amnesia: The Dark Descent, featuring an entirely new focus on atmosphere and horror. It focuses less on startling the player and more on immersing the player in a deep, subtle story with psychologically horrifying themes. All item glow has been disabled, so try everything, repeat, EVERYTHING. All items include a description of their use upon interaction, so if you're stuck, try messing around with everything, and think hard about your ultimate goal. This story was inspired by Myst, so the puzzles will feature similar attributes and you will need to use your head often. Play in a dark room with headphones if possible.
With no doubts my favorite total conversion I've ever played. There is not to much of Amnesia HPL engine total conversions, not mods. But nevertheless the Deterioration is surely the best one at least I believe so. Absolutely unique style of building atmosphere and developing story and characters. Unlike the original game the Deterioration is focused not on the absolute terror with unstoppable monsters hunting you ever forever, but a lot more on the very depressive and gloomy atmosphere. One of the most memorable gaming experience I've ever achieved, cause I do not remember any other game (yes, game, not just mod) that was so tragic and touching, truly deep one story.