Diablo 1 HD Hellfire Mod | Awake

Forgive my ignorance, but I just couldn't figure out what it does. I don't notice any changes with it on or off.

I thought it maybe enables/disables monster knockbacks and getting frozen by certain mobs, but no. It has no effect on stuff like this. So what does it do then?

I think it's the visual effects of certain skills, didn't really play without it to know which ones. They still work and do damage but you just don't see explosions and stuff. Not sure if this is it thou.

I tried asking the devs directly in their Facebook group but didn't get an answer unfortunately. Really curious what this option actually does.