As above, I know not many have it so there you go. Really glad I forced myself to play loads of PVP to get it a couple years ago 🙄
Acrius catalyst is probably pretty rare too.
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Acrius itself is rare. Especially if you're like me and don't have it because of a likely screw up on Bungie's part. I did get Acrius in Y1, never upgraded it, but I got it. Even bought it from Calus's robot during Opulence because I couldn't pull it out of collections. Still can't pull it out. Have to go to the monument and spend Spoils for a weapon I'm already supposed to have. Besides, Bastion exists. It basically has Trench Barrel and One Two Punch now.