do you think the wildfire under king's landing might be used to blood-sacrifice the entire city?
blood sacrifice is usually performed by lighting things on fire, and king's landing does have a lot of blood in it - king's and normal both - and it would be very, very easy to set on fire
and there is a guy we know
>who loves murdering people
>and who's interested in evil magic
>and who's working on stealing a dragon
>and who might know about the wildfire without anybody having told him about it