The Mad King was obsessed with it. He loved to watch people burn, the way their skin blackened and blistered and melted off their bones. He burned lords he didn't like. He burned Hands who disobeyed him. He burned anyone who was against him. Before long, half the country was against him. Aerys saw traitors everywhere. So he had his pyromancers place caches of wildfire all over the city. Beneath the
Sept of Baelor and the slums of
Flea Bottom. Under houses, stables, taverns. Even beneath the Red Keep itself.