They seem to increase the effectiveness of spells that are in the same path if they are up.

So I have some questions.

Do they help by:

Making saves harder?

Acting as a sort of enhanced damage for same path spells?

Do they help in resisting or lessening same path spells?

Do they weaken spells or make spells easier to cast if the opposite path is use. (I.E. Channel heat up and cone of cold being cast.)

T.I.A.

There are edges that increase effectivness of spells like nightcaster or that water one.

Do these affect saves? Do they affect damage?

Most importantly do they stack and are they compatable?

T.I.A.