NeoCore is an enemy and weapon replacement mod with its feet deep in the sci-fi theme. Instead of (just) zombies and demons, you'll be fighting cybernetic troops with purple blood and Mutants that spew green and yellow gore, Realm 667 monsters that have been edited to paint the walls with various saturated blood colors, all the while wielding powerful- "alternatively" colored guns with absurd names a la 90s game fashion like UT99