The sentence:
Evil is not without its attractions-- symbolized by the mighty giant or dragon, the power of the witch, the cunning queen in "Snow white"--and often it is temporarily the ascendancy.

About "symbolized", which does it modify; "attractions" or the entire sentence in front?

IMO, it's the latter, but I'm not sure on this one.
'Symbolized' modifies the whole idea, I think, Taka-- the attractiveness of evil, which is symbolized... (By the way, there appears to be a preposition missing from the quote- 'in the ascendency', isn't it?)
You are right, MM. Originally, it is "in the ascendancy". It's a typo. Sorry about that.