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I just remembered that the heretic was robbed on the first night, and the fifteenth from the end is Amko. This complicates things – either the heretic is the murderer, or someone is framing him.
The poison in Amko's goblet immediately makes me think of the information in Reven's profile:
Sir, if I was your wife, I would poison your tea
Madam, if you were my wife I would gladly drink it
In my opinion, it's quite beautiful, but not very intricate. I don't know how complex the clues are this time around.
Or maybe it's not a clue at all; the heretic is a witch, and someone stole a vial of poison from him and added it to the treasurer's drink, but it would only take effect on the following night.
In short, there are many candidates for execution.