Rowen_Kun
I think you are forgetting one thing and that is null has power over darkness he is something similar to goddess Nyx the primordial Greek goddess of darkness and you are only showing one aspect of his power and that is dark slime that's what he is and you are not even using his real colours darkness itself is his domain is not red in colour please black in colour so he should be something similar colour doesn't show what your kind of power you have but if you are saying is similar or he is null of that dimension then he should have that much power if he doesn't even know that what he us, he should have some kind of control over darkness or you are not even thinking about that because the way I am saying the whole story and you are saying that he has the power over darkness or not if he is null of that dimension