An excellent attachment for both Beregond and Erkenbrand. With Beregond you get to attach it for free increasing his survivability and also providing a means of triggering Sterner than Steel. With Erkenbrand the helm gives you the means of triggering his shadow cancellation while circumventing the cost of doing so. The helm's damage cancellation also pairs nicely with The Day's Rising ensuring the resource generation after the defense. All around solid card for a dedicated defender!
Sadly, if you use the helmet to cancel the damage dealt to Erkenbrand, technically the cost to trigger his ability has not been paid, though I can't remember where the official ruling regarding that would be found.
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AlasForCeleborn
723
I can confirm that for card like Erkenbrand or hero Treebear actually taking the damage is part of the cost of the ability, so if you prevent that damage you are unable to trigger the ability. You need to heal the damage afterwards. Still can be good for Erkenbrand so that he can absorb some damage from attacks to more freely use his ability. And generally speaking an excellent defensive attachment.
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Alonewolf87
2536
I prefer that attachment even more with Energy #Beregond !
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Blackmambo
7