I got it today!!! Sign here if you have acquired this trophy of the Vault of Glass. :)
EDIT: It's a one-hit to Oracles on hard and it's a very rare drop; more rare than an exotic in the chest.
EDIT: Don't argue about it being a one-hit on hard or not. just say you have the wonderful, one-hitting, trophy, fusion rifle.
EDIT: Wow 500 people have this gun so far. Thanks for all the replies!! :D
EDIT: It seems 826 people have the gun. WOW!!
EDIT: [BUZZ BUZZ] "CLEAR!!" [BZZZZT] "This post has been revived! :D"
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Got it early on and didn't realize how rare it was until people started seeing me use it.