What is "Resonance" (that gives me additional light on prestige)?
Resonance is a bonus to Light gain based on each non-white essence. Meaning if you let all the tanks fill up before converging you gain more light. I could have explained it better, Thank you for the comment! :)
And purity bonus, exactly?
Purity seems to be a multiplier seems to very roughly scale by 1% for every 1k White Chroma you have, with diminishing returns.
As an example, I was able to get the follow Purity Bonus % for certain White Chroma totals:
