How to free True Soul Nere from the cave-in in Baldur's Gate 3

Once you arrive in the Grymforge portion of the Underdark in Baldur's Gate 3, you'll quickly determine that you should find a way to free Nere before you leave. He's another one of the Absolute's True Souls, trapped behind a cave-in and close to inhaling a lethal quantity of poison...
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