I'm sure i'm not the only one who agrees that the witch kings aura FX is not only unneeded and shouldn't be there (no heroes have aura Fx's its bfme not warcraaft 3 O_0) but it doesn't really fit in, it actually takes your attention off of the model which is a shame.
In case you don't know what i'm talking about:
(note its a bright red in game)
to conclude I really hope the teams removes it