Being the first Master raid in Destiny 2, there's new "Timelost" versions of the weapons, but whats going to make them special? I already have an OG Fatebringer role and a god roll Praedyth's Revenge and I don't see the reason to farm for the Timelosts versions if it's just a color update or allows the use of Adept mods.
With the release of the "Corrupted" Expunge missions and the weapon able to have two legendary traits in the last column. I think you're heading in the right direction so let's keep it up. I think the Timelost Versions should have two traits in both trait columns so people can find a perfect god roll to farm and also allow the use of adept mods. Adept mods should also be farmable in the master raid.
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Probably double loot, higher chances to get god rolls or adept versions of the raid weapons.