What are all the ways to acquire a Dragon Tail Thanatos?

As far as I know, Cygnus drops the weapon and the recipe but I'm not sure if the latter does drop from her yet. It should though.

I've never seen her drop any Empress recipe other than the cape recipes.
Pretty sure the only way to get said weapon, asides from Marvel, is killing Empress and hoping it drops.

Alright, thank you! Seems it must be a real pain to defeat her, I haven't tried going yet. But mage capes and shining rods are incredibly expensive in the FM. xP