So on page 30 of the manual (not the PDF page 30 but the page that is denoted with the numeral 30) here is what I find confusing, specifically with what has been said here:
"The Circle of Lightning also has an additional effect roll. Because of Brogan’s Lightning +2 trait also adds +2 to the Hydra’s effect die roll."
As far as I can tell the trait is Lightning +2 as it states nothing as you have stated.
Once again on page 24 of the manual:
"Some attacks gain a bonus against targets with particular traits or subtypes. For example, Samandriel, Angel of Light has +1 vs. Nonliving or Dark creatures listed on her attack bar. If she is attacking a creature with the Nonliving trait, or from the Dark school, she adds +1 die to the number
of attack dice rolled, and also adds +1 to the roll of the effect die."
Same thing again.
And finally on page 24 of the manual:
"Add or subtract all of these modifiers from the number of dice listed in the attack bar.
Roll a number of dice equal to the final, modified attack value. If the attack has any possible additional effects listed in the attack bar (always shown as an additional effect box with a d12 icon),
also roll the effect die at the same time, and add or subtract any modifiers to that roll.What I cannot find in the rules is a clear statement of when to apply modifiers to effect rolls. Other than in the last underlined section. I see in the examples that they are applying trait modifiers to effect rolls as well have, but the ruling states otherwise.
Sorry I am a bit pedantic and I am still confused of when I should or shouldn't modify effect rolls, I am hoping that Arcanus can point me to the place in the manual that I keep missing.