Lightbringer
Lightbringer is the sword of Azor Ahai, a legendary hero who is prophesied to fight the Great Other.
Description
Lightbringer is thought to be a sword made of living fire. It was created by Azor Ahai after several attempts Azor Ahai's first two attempts were destroyed when he tried to quench them in water and then the heart of a lion. On this third attempt, he plunged the burning blade into the chest of his beloved wife, Nissa Nissa, quenching the blade with her body. When he pulled it out, the sword burst into flames.
Stannis's Lightbringer
Under the direction of Melisandre, Stannis Baratheon attempted to take the mantle of Azor Ahai by plunging a sword into a pyre of burning relics of the Seven. When he pulled the sword out, it glowed with a magical light, but close inspection revealed that the sword was not actually hot. According to Maester Aemon, the real Lightbringer both shone and radiated heat.