I liked the Twilight movies, but I kind of feel like they ruined

Come to think of it, I think I want to call the event that caused the world to be the way it is now the Twilight, as well as affected organisms.

crepuscular

My Little Pony didn't help much either.

call them Umbras
And the disease, Pholemiomis.

A recombinant virus causes regular and some animals and (rare) humans to become Umbras, a type of mutated organisms reshaped into aggressive forms. The only think it does not affect is stone, timber and other "dead" vegetation, non-plants (cotton, seeds, etc). Machinery / metals turn into a glassy stuff and plastics and organic polymers get melted.
237 years later, humanity is absolutely struggling against Pholemiomis as the mucus resulting from reshaping animals and plants and machinery, thus we devolved into some sport of gothic-victorian-agey society of cynical, dark individuals, a society built on forbidden sciences and occult knowledge to maintain its survival.

I can play with your setting for yours.

>>8366622
>crepuscular
I don't like it, but you've introduced me to a lot of good related words.

>>8366642
I'm glad you like it, use it if you want. It's certainly not my OC. I like Umbras though, you guys are really helping me brainstorm here.