Good question, I've encountered the same situation yesterday with an Ogor's charge ability.
the Ogor ability let's you roll dice equal to the charge roll (in this case it was 11) for each roll of 4+ a mortal wound is dealt.
However. since the UNIT has the ability, and the ability is only triggered once. damage from that one ability (let's say 6 dice were a 4+) would be 6.
Which Gotrek then would change back to 1 damage because of his ability:
If the damage inflicted by an attack, spell or ability that targets or affects this model is greater than 1, change it to 1.
I'm quite certain the rules as written are the rules as intended in this case. Since Gotrek is quite strong against a single SOURCE of incoming damage.
So you look at the source of the damage. A single attack can deal 1 damage, a single spell can deal 1 damage. a single ability can deal 1 damage.
IF you you look at the charge ability from, let's say, Bloodcrushers that ability states that the source is the MODEL, not the UNIT. and therefore Murderous charge would deal multiple instances of 1 Mortal wounds.
TLDR:
When a unit has an ability Gotrek suffers 1 mw from that unit.
When each model in a unit has an ability, Gotrek can get wounded by each model in that unit.
This way the rule makes most sense to me. but i'd love to hear what you guys think if you disagree
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).
Gotrek and mortal wounds.
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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).