Do you have a clean "SoD" installation, without any patches or WoG? If so, you might need to install the ABinSoD patch. It's useful in any case, as it unlocks some content from "The Blade" in SoD: the Conflux, its objects, creatures, adds menus, and all the story Campaigns from "The Blade".
Why did I remember the note about composite artifacts? It seems that the artifact codes were changed there, and "The Blade," which was at the edge of the range, might have become unavailable.
And what did the exchange window look like when you brought the seer what he wanted? Was there an image of "The Blade" there?
Of course, I would like to hear the opinion of experts: I am just a player with experience...
Hooray! Eureka! I've figured it all out! My last guess turned out to be correct. The answer is very simple (see the picture):
Attention! Comrades! A scam from the game's creators has been discovered in the game! ;) Of course, they just forgot, but how annoying! :mad:
So, Melpomene only says that she will give you the "Blade of Armageddon," but you should have seen in the picture that nothing is actually offered as a reward!? And you agreed to this yourself!
Anyone can verify this by opening the map in the editor: the hut is located in cell 24,10.
(Василь Симоненко. Люди – прекрасні)