Diseases and spell power (Impurity talent question)Follow

First off before I am flamed; no I am not suggesting to go for any stats with spell power.

I know that FF and BP increase in damage by your attack power. My question is, do they increase based on your spell power (ie the Impurity talent now helps for more than just DC's and IT's?) So they would get a double bonus in a sense. From AP to start then AP again indirectly through impurity.

My guess is that spell power would increase disease ticks, but I wanted to ask first. If so, I am leaning towards taking 3 out of blood caked strike to max out impurity for my 19/0/52 PvP build.

As MentalFrog wisely pointed out, spell power does nothing. Every ability that does spell damage has a base damage, then adds on an attack power modifier, essentially what would be spell power on other classes.

Impurity increases the amount of AP used in that calculation.

Nooooo. BCB is much, much better.