Dreamfyre was stabled in the Dragonpit. After Queen Helaena Targaryen's six year old son was slain during the civil war Helaena spent her days in darkness, weeping, and was not capable of riding her dragon. She eventually went mad with grief and threw herself from her window in Maegor's Holdfast and died. At the moment of her death Dreamfyre rose suddenly with a roar that shook the Dragonpit and snapped two of the chains that bound her.
During the Storming of the Dragonpit the four dragons lairing within the dome were in chains. Dreamfyre was the only dragon able to break free when the mob broke in. She broke from her remaining bonds and took wing. She circled the cavernous interior of the dome and swooped down to attack the men below. She slew more men that the other three dragons combined. The mob pushed through her attacks and she was within easy reach of archers and crossbowmen. They loosed arrows and quarrels at the her. Wherever she lighted men swarmed to attack her driving her back into the air. Eventually one of her eyes weas nicked by a crossbow bolt. Half-blind and maddened Dreamfyre flew into the Dragonpit’s great dome above. The already weakened dome cracked on impact and half of it came tumbling down, crushing her and dragonslayers under tons of broken stone and rubble.