Relics

Relics is an Avatar: The Last Airbender comic that was released by Dark Horse Comics in order to celebrate "Free Comic Book Day".

Overview
The team stop at an Earth Kingdom village to restock for their journey to the North, but Aang discovers that he may not be the last Airbender.

Synopsis
Team Avatar arrive at a small Earth Kingdom trading village during their journey to the North Pole in order to get supplies. While there, Aang meets a Merchant who attempts to sell him an ancient Air Nomad necklace. The Merchant informs him that the necklace is in fact not ancient, and the seller had recently traded it for medicinal supplies. Aang finds out that the necklace comes from caves in the mountains and, while Katara and Sokka are sleeping, sneaks off in order to investigate.

In the cave, Aang finds many Air Nomad artifacts, but also finds the Fire Nation Admiral, Zhao. Zhao quickly captures Aang and shows him the Merchant helped lure him into the cave, much like some of the Air Nomad Genocide survivors were lured into the caves and killed by Sozin. However, using the artifacts in the cave, Aang manages to free himself and get back to Katara and Sokka, who have been searching for him. The comic ends with a short conversation between Aang and Katara:

Katara: This place reminds you of home, right? All these mountains... Airbenders would have loved to stay here. They would have been attracted to the place.

Aang: Yeah. A few of them probably were.

Trivia

 * This comic takes place in Book 1: Water.
 * This comic reveals that some Airbenders did survive the initial attack on the Air Temples and began to regroup in the Earth Kingdom, but were eventually drawn to caves built by the Fire Nation that they decorated with Air Nomad artifacts. Using these caves, Sozin sent out rumors saying the Air Nomads could find refuge in these caves, but killed the survivors who went there.