Corrupted Ashbringer + Deathknight = Dream /How??

[UhmHi]

Hi! First of, I would like to congratulate Blood Legion with their steady progress, aswell as DREAM Paragon.

However, I am troubled.

In their picture taken shortly after killing Elegon ( Blood Legion that is ), I seem to spot a Deathknight named Riggnaros in the bottom left corner, wielding the Corrupted Ashbringer?
How this is possible when 60 Naxx was removed before you could create one, baffles me.

Oh, and Inb4 "Nah, he's just a warrior transmogging Dk-lookalike gear". The gear he wears is the Conquerors tier from Ulduar 25, class-restricted, so no.
Not to mention the appearance of a Bone Shield being active.

Anybody got a clue about how he managed this?

\o/

[Resentful]

Not hard, I can share it here actually however I'd be violating a rule obviously. Thus I can only tell you via to search google or youtube and this ''bug'' has been working for a very very long time.

So it shouldn't be too hard to find on your own hm?