Can anyone tell me which mod this is?

[terifaerie]

I've had it for a while as part of a collection, but it seems to have disappeared from my UI. If anyone can tell me which mod this is, I'd really appreciate it.

http://new.photos.yahoo.com/theresadchandler/photo/294928803323303078/0

[Matthias]

It doesn't seem the exact same, but ttst http://www.wowinterface.com/downloads/fileinfo.php?s=&id=4455 seems quite similar.

[Redmumba]

Necrosis.

http://www.curse-gaming.com/en/wow/addons-3089-1-necrosis-ldc.html