Months later, while in a coma after Azula's lightning attack, Aang was tasked with catching multiple Spirit World fireflies and placing them in a lantern. Once he completed the task, Roku's animal guide, Fang, appeared and guided him to Avatar Roku.
The Spirit World firefly has large eyes, a wide prothorax, and long thorax with wings spreading back to a luminescent tail. The head is smaller than the rest of the creatures body and it has six legs. The tail is capable of producing a light bright enough to encompass the creature's entire body.