Balian Rockhammer's Horn

[Astinek]

Found this item on lvl 9 Torment dungeon.


Item description:

Cube reagent

Cubing formula:
Balian Rockhammer's Horn
Any Unique Hammer.

Tried every unique hammer I had in stash.
From War Hammers to Great Mauls.

Can not get this item to work, wonder what I am doing wrong?

If anyone encountered this Item before and knows how to use it, please let me know,

Regards.