Does Innate Focus (EPG Tier 3 Magic Talent) stack with Signature Spell (RoT Tier 2 Talent)?

I would have thought so as it isn't change the a "specific set of one or more effects" of the Signature Spell. All Innate Focus is doing is adding damage and perhaps dropping the difficulty, not changing the effects.

I see no conflict between the text of the two Talents and I don't recall any general rule that'd prevent them from stacking, so I'd say they do stack.

There is nothing that would disallow them to both work together, as long as you are only using your chosen Signature Spell combination.

Signature Spell is about using the same spell action and extra effect, it has nothing to do with the difficulty of the spell.

10 hours ago, c__beck said:

Signature Spell is about using the same spell action and extra effect, it has nothing to do with the difficulty of the spell.

Not entirely true as the additional effects add to the overall difficulty, but I get where you're coming from.

Innate Focus adds nothing to the effects of the spell. As long as your Signature Spell is from the Attack family, the damage would increase and the difficulty reduces by 1.