So im in the process in doing the questline, im at the stage where you have to complete activities with the rose weapon. But im not able to locate the weapon; i looked around my inventory, vault and postmaster to no avail.
My friend has completed this questline and said that the weapon Rose is something you can not dismantle so there that.
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Have you tried reobtaining from collections? Plus, the weapon certainly can be dismantled.