I'm a cone-warlock.
I do Lightening & Evil damage (From my Celestial Pact and Utterdark Blast respectively).
What spell powers should I focus on for maximum damage? Because I feel like I do very bad damage at level 6. I mean, I know my Pact damage is Electric spell power & universal.
Is Evil just off of Light spell power?

And on that topic; does Universal stack with the other spell power types? Or is it a case of the game using whichever is bigger?