I just feel like the colour doesn’t explain anything, and forces us to ask questions without answers.
If the monochromatic Exegol is the problem, I think changing up the colours of the planet, temple, or even just the mist/fog would better break up the blue than to introduce new powers/looks for established powers.
What questions does it force you to ask? It’s literally simple.
Red force lightning = more evil power.
Simple as it can get. Not even a “new power”.