Item from A Song of Ice and Fire by George R.R. Martin
A volatile green liquid fire created by the pyromancers of the Alchemists' Guild — it burns on water, cannot be extinguished, and has been used to destroy fleets and obliterate holy sites alike.
Wildfire is the nuclear option of Westeros — a weapon so destructive that using it changes the user as much as the target. Tyrion deployed it at the Battle of the Blackwater, igniting the river itself and annihilating Stannis's fleet in a conflagration that lit up the night in green. Cersei used the Mad King's hidden caches to destroy the Great Sept of Baelor, killing the High Sparrow, the Tyrells, and hundreds of worshippers in an act of terrorism that horrified even her allies. The Mad King himself planned to burn all of King's Landing with wildfire rather than surrender it — 'burn them all' — and Jaime killed him to prevent it. Every appearance of wildfire in a scene raises an implicit question: who is willing to use this, and what does that willingness reveal about them? It is the measure of desperation, the tool of those who have decided that winning matters more than what survives the winning.
A bright, almost luminous green liquid stored in fragile clay jars. It glows faintly in darkness and burns with an eerie emerald flame that clings to everything it touches. The substance is unstable — old wildfire can ignite from a hard look — and the jars must be handled with obsessive care.
Also known as: wildfire, the substance, green fire, pyromancer's fire