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The Amulet of Skill increases the rate at which rage builds up. Something like one and a half times, or thereabouts.
If your friend only plays Winghelm, you can believe me that he will lose very quickly with any other hero. He's just too easy to play with.
Regarding Shackarukath – of course, the wyverns are significantly strengthened. There's no arguing that. It's just that if they were given the usual + to defense and attack, Shackarukath would be stronger than he is now.
It's just that, in my opinion, compared to Tilshek, Haggeesh, and Krag, he's a little weaker. On the other hand, maybe specializing in a level 6 unit is too powerful, and that's how everything is balanced.
Well, good luck in the battle of the century! To be honest, as a fan of playing as the High Elves...
I can tell you the best build for Winghelm against Orcs (in case it helps you prepare better for the battle?).
Skillful Attack - Tactics, Archery
Skillful Leadership - Troop Gathering, Speed Aura, Forest Leader
Skillful Luck - up to Elven Luck
Skillful Light - Righteous Strike
It's all aimed at making the first strike as effective as possible (attack, leadership, luck, + Winghelm makes a general speed boost with his very first move, and it all repeats).
