I found a tower and opened a (trapped) chest that exploded immediately, killing me in the process. The loot/ender chest got destroyed as well but I still get an icon in my inventory screen that allows me to access it, even though there are no ender chests near me. Sometimes, this icon bugs out and appears in the middle of the inventory screen, right where all the other items are, making it hard to click where I want

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This is not a bag this because of Ring of the Seven Curses for the mod Enigmatic Legacy. At the begging of the game you have as start item in your inventory The ring an amulet and akashic tome. When you die and you pick up your items from the tombstone the ring will be automatic equipped in the curio slots and the amulet as well. The problem is you can't unequip the ring any more you can't even sleep it's bounded to you until you gain the ring of seven blesses. The ring give that ender chest. You should read what the ring does at the beginning. If your not ready for this challenge start a new wort and destroy the ring right at the begging.

Ahh, good to know! I did notice that I had the ring equipped afterwards and was kind of bummed out about it because I did not want to wear it. I tried to google Enigmatic Legacy on the Ring of Seven Curses but there's not a whole lot of documentation on it so I decided to try a new world just to be safe.

Sorry for wasting your time.