Shield Elf

• Gurthang, Wand of Death
Possesion - Hand Weapon
Strength +2
Vitality +1
Bearer must be Turin.
Skirmish: Exert Turin to make a minion skirmishing Turin exert twice (limit once per phase).

Not bad - I think it works better as an artifact, and the ability is worded oddly and fairly limited. Other than that, I think this would be a weak 3 cost, but a strong 2 cost card.
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SoP

Gurthang, Iron of Death
Artifact • Hand Weapon
Strength +2
Bearer must be an Elf. Bearer is damage +1 If bearer is Turin, he gains Intimidation. (During skirmishes involving this character, the opponent may not use skirmish special abilities.)

Good choice of cost and culture. It’s an artifact, so that looks good. However, I don’t think Turin would be able to bear it (as he was a Man), and it’s not unique (although I realize it was probably intended to be).
Other than that, it’s a good card.
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Celebrimbor

•Gurthang, Iron of Death
Artifact • Hand Weapon
Strength: +2
Resistance: +1
Bearer must Turin. He is damage +1.
Skirmish: Remove from the game 2 minions with strength 8 or less from your discard pile to wound a minion Turin is skirmishing, or to make a minion turin is skirmishing strength -1.
"And though ever black its edges shone with pale fire; and he named it Gurthang, Iron of Death."

Okay, it doesn’t look bad. Good use of a quote, although I find it better when the name of the card isn’t in the quote. The ability is interesting, although also oddly worded. Interesting choice of boosting resistance.
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Dain

•Gurthang, Reforged of the Flaming Star
Artifact • Hand Weapon
Strength +2
Vitality +1
Resistance -2
Bearer must be a unique or companion.
If bearer is Túrin or Beleg, he is damage +1.
While bearer is at a battleground, forest, or underground site, each minion skirmishing bearer is strength -1.
“‘Hail Gurthang! No lord or loyalty dost thou know, save the hand that wieldeth thee. From no blood wilt thou shrink.’”

Ah, Dain... Good quote (where I got my subtitle). Cost and culture make sense, and a decreased resistance. Easily transferable is also a good thing on it. Very fitting with the lore - it works for whoever holds it. As long as Turin will be able to bear it, well made.
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macheteman

•Gurthang, The Blacksword
Possession • Hand-Weapon
Strength: +2
Bearer must be Turin.
Each time Turin wins a skirmish, discard each minion he was skirmishing.
It was said, that nothing which Gurthang had bitten could live.

Should probably be an artifact, and Hand Weapon should have a space rather than a hypen (but that’s a minor note). I don’t quite see the ability with the text or lore. However, the text and lore fit together very well as well. It might bea bit strong, though.

I also think BW’s response text could have benefited from a "you may" somewhere in there...the ONLY flaw I see in either card.