A volatile, green-burning substance produced by the Alchemists' Guild in King's Landing. Wildfire burns with intense heat, cannot be extinguished by water, and burns even on water's surface. It becomes more volatile with age. The Mad King Aerys planned to burn King's Landing with wildfire rather than surrender it. Tyrion Lannister uses it to devastating effect in the Battle of the Blackwater, and Cersei later uses hidden caches to destroy the Great Sept of Baelor.