Raven-winged Helm

Attachment. Cost: 2.

Item. Armor.

Attach a hero with Sentinel. Limit 1 per hero.

Response: Exhaust Raven-winged Helm to prevent 1 point of damage just dealt to attached character.

He had a small hauberk, its rings of forged of steel, maybe, yet black as jet; and a high-crowned helm with small raven-wings on either side, set with a silver star in the centre of the circlet.
The Return of the King
Blake Henriksen

The Wastes of Eriador #5. Tactics.

Raven-winged Helm

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. — AlasForCeleborn 509
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. — Alonewolf87 1620
I prefer that attachment even more with Energy #Beregond ! — Blackmambo 7