Every full moon, the Demoman succumbs to a terrible curse. Ghostly armor projects onto him, telling him to take up their cursed blade and use it to kill humans in battle. Fortunately for Demoman, that's basically his job.

This ghostly blade has all the killing power and cursed badness that the Eyelander has, but here's the kicker: It's incorporeal! No metal whatsoever, so there will be no fuss when having a killing rampage at an airport.
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The TF2 Emporium 2013 Halloween Special is out now, guys! If you want a mod release, you can get it here:

http://halloween2013.tf2mods.net/