Endrin

Avatar of Grimnir states that the damage inflicted by attack/spell/ability (when greater than 1) gets reduced to 1. I tend to think that they mean the total damage of the attack/spell/ability in this case, otherwise they would've worded it differently like we see in Shoulder Plate of Edassa: Roll a dice EACH TIME you allocate a mortal wound (singular) to this model. The weird thing is that, according to the rules, we have 'damage' (a statistic paired to attack) and 'mortal wounds' (which is something different). It gets used here for both and that makes it confusing. Spells, for instance, don't normally do damage, they inflict mortal wounds. But I still think that the intend would be to target the total damage (so total mortal wounds done) by the source (in your case an ability).