Made by Epic Weapons (the people who brought you Frostmourne), this is a heavy-duty item. First off, it's huge. Compare it to the Frostmourne replica up there -- that's a big freaking hammer. The detailing is nice as well, complete with the Frostwolf insignia Thrall must have added after he took the giant bladed spike off of the top. I'm not sure why Thrall did that. I guess he felt like it was overkill or something -- and he's right, it is already an impressive hammer without it.
Head on over to Epic Weapons to take a look for yourself.
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