Great Protector was a female dragon from the dimension of Ta Lo. In ages past, the Dweller-in-Darkness broke through and demolished many of Ta Lo's cities, with no weapon able to stop it. The Great Protector provided people aid against that enemy, as its scales were the only thing able to harm it and the Soul-Eaters. After Dweller-in-Darkness was locked away behind a barrier of dragon scales, the Great Protector retreated to a bottom of a lake. A village was build on that lake to watch the barrier, whose inhabitants fashioned weapons and armor from the dragon scales.
When Wenwu of the Ten Rings arrived to release the Dweller-in-Darkness, he used his Rings to push his son Shang-Chi into the lake. While in the lake, Shang-Chi met the Great Protector, who brought him back to the surface and allowed him to confront his father. Wenwu began breaking the protective barrier, which let through the Soul-Eaters that began attacking both the Ten Rings and the Ta-Lo residents. Since only the dragonscale weapons could hurt them, the Ten Rings ceased their hostilies and joined forces with the Ta-Lo against the creatures, while the Great Protector joined the fight, aiding Shang-Chi's sister Xialing. When the Dweller-in-Darkness itself broke through, it battled the Great Protector and as about to consume her soul when Katy shot a dragon-scale arrow in his throat, disrupting the process. Shang-Chi took up the Ten Rings himself and used them while riding on the Great Protector with Xialing in order to fight and defeat the Dweller-in-Darkness, though it was at the cost of many of the Ten Rings' forces and the lives of the villagers of Ta-Lo.