Lord Varys is executed for treason by dragonfire after trying to support Jon Snow's claim to the throne.
After her forces easily breach the city and the Lannister army surrenders by ringing the bells, Daenerys Targaryen makes the shock decision to raze the city and its civilians anyway. [S8E5] The Bells
Arya Stark abandons her quest for Cersei on the Hound's advice and experiences the horror of the city's destruction firsthand before escaping on a white horse. Lord Varys is executed for treason by dragonfire