How to solve the Rosymorn Monastery puzzle in Baldur's Gate 3

You might come across Rosymorn Monastery as you near the end of Act 1 in Baldur's Gate 3. This is when you get the choice between travelling through the Underdark or taking the mountain pass to get to Moonrise Towers. If you choose the latter, you'll find the run-down monastery off the main track, along with a fairly tricky puzzle to solve...
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