How to solve the Sarin skeleton puzzle in Baldur's Gate 3

The Baldur's Gate 3 Sarin skeleton puzzle is one you find while roaming the sewers and cisterns of the city proper in Act 3. In the centre of the underground region, you'll likely bump into Aelis Siryasius and his army of grease creatures. This wizard is on the run from Absolute cultists, and if you can't convince him you're friendly, you'll be fighting for your life against his fatty monsters...
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