The game allowed me to upgrade an item to improve power level that I then could not wear so could no longer kill the monsters in the raid I was in. The item that I used to upgrade the item that I could not equip was equip-able so a warning saying you cant do this would be nice.
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Pay more attention to what you're doing. This has been a thing since day 1 D1. I fail to see how it's the games fault you ended up in this position.