Talk:Materials/@comment-180.190.114.179-20160815034821/@comment-1419424-20160815041205

It's an ultra-rare devour reward and mission reward for fighting it.

Honestly, if you can get even one, your best bet for getting more would be to farm Black A-Tickets and exchange for them. But until then, just fight it over and over again and hope you get one from devouring, or from mission rewards. There are skills like God of Rare Drops and Gourmet that will increase your odds, though, but seriously just keep fighting it and you'll get one eventually.