I think that the HM Crota's End raid will start dropping the Crux after week one has been completed.
Because when everybody completed CE for the first time on normal it seemed overwhelmingly that everybody got this combination of gear:
Cryptographic Shader
Crota's End Emblem
Radiant Mats/Raid Weapon/Exotic Weapon
And so to me it only makes sense that the first drops we would get for beating him on hard mode is likely to follow this formula.
Glowhoo Shader
Radiant Mats
Raid Weapon/Exotic Weapon
And that starting next week (since the [i]guaranteed[/i] drops from CE:HM will be out of the way) the Crux's will begin to drop and we will first see the glory of the Nechrochasm.
Any thoughts or input on this?
Like I mentioned in the tag, this is all speculation based on precedent for the DLC content.
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The reason the shaders dropped week one is because you only get it if you don't already have it, they didn't change the loot.