Ok... here is what I really thought about this essence -
I think the chaotic force would affect
already Chaotic creatures (Alignment and religion wise) some less than it would affect the Order aligned creature.
Since it is not merely means to deal some physical damage, but also causes some
mental damage, I think those who would suffer the most from it are those that oppose chaotic nature.
Thus maybe a factor should be added depending on whom the essence was cast upon, whom it affects more and for how long. So 1d4-1 for chaotic aligned and 1d4+1 order aligned, would seem more proper. the Neutrals can stay the same.
About effecting the target at all -
I too agree that when the target has a body , it is more subject to this power. However, I cant see how mentally created images wouldnt suffer at least its minor influence. Chaos disarrays what is normally built/created... so even Diadria would not have a say in this.
Rather what would withstand this energy would be the entropy itself, as you cant make entropy more chaotic than it is ((maybe in thermodynamics you could

))