A 5-star, legendary offense boot disappeared from my inventory while I was selling artifacts. I presume I misclicked it but there's nothing I can do. Second time something like that's happened - i had first opened an account with a different email but accidentally sold one of the free daily epic lifestealer set pieces you get so I made this newer account just to make sure I didn't lose that set. I've started counting before I hit the sell button every time which is a tremendous pain. I wholeheartedly wish they'd have a lock-gear or buyback feature built into this game (and make it retroactive by about a month...? no? ok, ok...). Please pass the word on. Enjoying the game otherwise. Wish i could merge those two accounts, though - my first ancient shard on the first account actually rolled me an epic hero. Anyway, learning as I go.