A bit of worldbuilding here
I’d like to point out that every dark magic user in WARTB (my fiction novel) that has dark veins (Darkish-Purple if they aren’t Dark Ones) and black veins if they are Dark ones. The veins pattern differs in the Dark ones (black veins that resemble human beings veins) and the other (It resembles twisted vines) a top of that, their hand caked with a light purple hue (mainly mauve) and end in faint swirls. (I hope you get the idea) The dark ones, however, their black veins extend to cover their whole bodies, even the legs and feet. Unlike the Dark Ones, the normal dark magic user; their darkish-purple veins only appear on their hands, and can’t reach the other body parts for unknown reasons.
I will sketch the dark magic effects soon, it’ll be a hands doodle only to show the idea. 😁😁