In order to access Bloomreaper, you must first complete the main campaign. Whereas being level 50 is not mandatory, it is recommended due to the challenge of the boss itself.
Proceed to one of the new Raid Boards in any of the main hubs. They are similar to the Bounty Boards but instead offer challenges for Raid Bosses.
Collect the Bloomreaper activity and head over to Tonnage Peel in Carcadia Burn. Enter The Bloom and fight your way through to the boss!
Farm Method:
Defeat Bloomreaper in UVHM Silver-tier (beat the boss in under 4 minutes) for a chance at Overdriver.
Utilize the Encore Machine to repeatedly farm Bloomreaper.
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