I think this would be a fine addition to the hard mode loot. We as players have it too easy with guaranteed loot from hard oryx. Make us work for it, by requiring 20 Harrowed moldering shards in the inventory. After a oryx hard kill, these 20 shards can be transferred for armor, weapons, or more likely 2 harrowed moldering shards.
To get shards you would need to play The warpriest, golgoroth, and the sisters, as well as opening the glyph and getting into kings fall.
I hope everyone likes this idea, so please bump and like to show support.