Where to use the Flower Key in Baldur's Gate 3

The Baldur's Gate 3 Flowery Key item is a bit of a mystery when you find it on the corpse of a shapeshifter skulking in a cave beneath the Open Hand Temple in Rivington. Smart money would be on it having something to do with the murder that just took place in the temple above that you're likely trying to solve at this very moment...
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