Changing Guardian of Empirion to red/yellow again

I have a vit opressor, and having those two green dudes seems weird as heck (swimming on red stuff). How could I change their color back to basic, without the transmuter?

Wish Crate would make something like if your vit damage is higher than poison, they keep their color.

Anyways, I opened the tutorials and I have no idea which one should I be using. A little help would be great!