He means something you can’t see just by looking at the 2d version like if you have red eyes and the you have blue over the top of them you would have to go into the skin to see it
I did such a bad job at explaining

What do you mean effects?

ayo you can just look at curses eyes or soul furnaces for a example

you should maybe try doing effects some time!
(i started it and its working out a lot for me!)

Pure curse

you know knuckles died in a landslide in his universe so veryone thought he evil so eggman retires and helps curse and since landslide curse can run at super sonics speeds anymore but after the curse it kills sally then eggman but while this happend tails was bulling curse and stalking him then curse left to the void and he met X terion,chaodix and normal cd