I decided to put this deck together since I've wanted to try Beorn for a while. I must admit it's mostly a ripoff of Wongaloid's deck, but with a few variations:

Heroes:

Eowyn

Glorfindel (spirit)

Beorn

Allies:

Arwen Undomiel x2

Bofur (spirit) x3

Northern Tracker x2

Imladris Stargazer x2

Zigil Miner x2

Escort from Edoras x3

Gondorian Spearman x3

Trollshaw Scout x3

Vassal of the Windlord x3

Gandalf (Core) x2

Attachments:

Light of Valinor x3

Unexpected Courage x1

Horn of Gondor x1

Ancient Mathom x3

Blade of Gondolin x2

Miruvor x2

Events:

Hasty Stroke x2

A Test of Will x2

Feint x2

Elrond's Counsel x3

Unseen Strike x2

Stand and Fight x2

So there's the deck. It's honestly the best I could put together given my cardpool (which includes up to OHAUH not counting THOEM), and so far it's been pretty succesful: It has beaten Carrock in the first try, Into the Pit in the first try, The Seventh Level in the first try, Flight from Moria in the second try (got screwed by those condition treacheries before the game even began), and even managed to beat Redhorn Gate in the first try (which means no Arwen and no Beorn in stage 3).

So what would you do to improve this deck? For example, I would take out the Trollshaw scout for Defender of Rammas as soon as I get HoN, and maybe put 1 more Arwen. I would also like to replace Unseen Strike for some better combat trick. What do you think?