I'm running through Tavnazia when I see a PLD with the Sanguine Sword equipped. I send a /tell and inquire about where he acquired it. Since I asked in English and he is Japanese (not knowing at the time), he replied "{Assault}{Mamool Ja staging point}" followed by "???{Sword}".
I'm beginning to wonder that maybe it is from the ??? Sword you get from Blitzkrieg, the Sergeant Major Assult in Mamool Ja staging point.
I've camped Almighty Apkallu for a couple days and never saw it pop, so I guess I could safely rule that out as the source of the sword.
Anyone have any info pertaining to the sword and its method of acquisition?