This has been stored away in my gm vault for demonstrating what an evil government might mete out as punishment.

PCs walk into town and there’s a public execution happening, it’s all horrifying screams burning flesh etc, until it finally stops and a hush falls over the gathered crowd. The silence is broken when chanting, faint at first, gradually grows louder and louder until it feels like you can hear it in your mind, just when it feels intolerable a flash emanates from the stake, and the screaming begins anew.