It is a thrown weapon introduced by Ragnarok that supposedly drops from Machae.
Preferably it would have the Dire prefix and the Suffix "Of Nightmares" but I understand that is very unlikely, so I'd take whatever I could get. The more vitality damage the better.
If anyone has one they would like to give me, I have plenty of really powerful items to trade with. Just tell me the sort of thing (or things) you are looking for and we can do a swap.