Just started farming for this on an alt and wanted to add some information here. There was a question regarding whether or not this could be obtained before reaching character level 85 that was unanswered on this page.
Using Zin'rokh, Destroyer of Worlds as an analogue... There are comments on the item page by Agrotarion indicating that multiple people have acquired the sword before 525 Arch or level 85. This would stand to reason that this too can be acquired before hitting those caps.
Wish me luck... Gonna go back to grinding this now. <3