Hero ability states:
“During each round in which you do not perform an attack, you gain 1 additional brown die to your defense pool.”
“The defending player – any player controlling a figure affected by the attack – creates his defense pool by gathering all the defense dice listed on his Hero sheet (in addition to any dice provided by equipment and card effects) or Monster card and rolls them for his defense roll. If an ability allows a player to add dice to this roll, he does so before the roll.” P.12 section 2, Roll Dice.
The way I see it, there are two ways to interpret this.
1, during each round in which you do not perform an attack with Jonas the Kind, you add 1 brown defense die to your defense pool. Meaning, after 3 rounds not attacking you would have 3 brown dice extra, on every defense roll, permanently for that encounter (as rules lawyer, I would say this).
2, during each round in which you do not perform an attack with Jonas the Kind, you add 1 brown defense die to your defense pool. Meaning, you can use that extra die only in the following overlords turn on every defense roll, after which the die “vanishes” (this is what my friend thought it meant).
I thinks it’s 1, so let’s assume that. The way we’ve been playing (4 heroes), each encounter lasts only around 6-10 turns. And having a hero not attacking is a tremendous loss. So I assumed it would result in permanent (during that encounter) extra dice for Jonas as compensation for not attacking. My friend thought Jonas would become overpowered with all these extra dice. But what is a brown die? Three times 0, two times 1 and one time 2 shields, which results in something between 0.5 and 0.6 shields per roll. Which doesn’t seem too bad to me, assuming the lack of attacking is such a great loss.