Minotaur Torch Hammer, Scorn lava launcher, Wretch naginata (the huge polearm they use), and HIVE BOOMER are just a handful of the weapons i would love to see brought up as either exotics or unique legendaries.
I also would like the scorn sniper rifle and sawblade launcher, and a Taken Phalanx shield (probably as a heavy "shotgun" that launches things similar to tractor cannon.
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Brakion's linear fusion arm...energy weapon of course.