I dismantled 2 year 1 exotics and when I went to get my 310 invective it was gone. I'm 100% certain I didn't dismantle my Invective. please find out what causes this problem if possible, a friend of mine lost his touch of malice and his king slayers shell too.
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You probably accidentally hovered over the wrong one. Just make sure you lock all your precious loot to prevent this from possibly happening again!