As the rules seem to be silent on the matter, as far as I could find, a question how other solve this:
A player casts an invocation with multiple targets, e.g. Strike the Tsunami.
One of the three targets is in Earth stance, another in Air stance, a third in Water stance and in Obscuring terrain.
Does the player...
a) ...roll one check, get two successes and only hits the first target, as target 2 and 3 have TN 3?
b) ...roll one check, get two successes and hit no targets, as the second target's Air stance gave him TN+1, as did the Obscuring terrain?
c) ...roll three Attack checks, one against TN 2 and two against TN 3?
Option c) seems to be out: It would allow the player to roll three checks with one action, thus spend Opportunities to e.g. heal Strife or Fatigue 3x in that one action.
Option one seems like the most sensible one (why should one target dodging or being obscured make hitting the others more difficult?).
But as the rules do not seem to say anything about it, I wanted to ask if everyone went with a).
Edited by Harzerkatze