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Many years after this, Avatar Kuruk intended to marry a Southern Water Tribe woman, Ummi, inside the Spirit Oasis. However, on their wedding night, Ummi was traveling across the bridge above the pond of the Spirit Oasis when she was kidnapped and taken to the Spirit World by the Face Stealer, Koh, to punish Kuruk for neglecting his duties as the Avatar. Kuruk gave chase, but he could not catch Koh and Ummi. Koh subsequently took Ummi's face. For the remaining years of his life, Kuruk journeyed to the Spirit Oasis on the anniversary of the wedding and searched for his lost love.
Chief Arnook and his wife visited the Spirit Oasis soon after their newborn daughter was deemed terminally ill. They placed their infant daughter in the pool and prayed to the Moon and Ocean Spirits, begging them to save her life. When the spirits complied, Yue's hair became white and she began to cry.
When the Fire Nation began its assault on the Northern Water Tribe, Princess Yue brought Avatar Aang and Katara to the Spirit Oasis so that Aang could cross over into the Spirit World. Aang successfully traveled over but as he was meditating, the banished Prince, Zuko, sneaked into the oasis and attempted to kidnap him. Katara made an effort to stop Zuko and had the upper hand, but was defeated when the sun rose and Zuko knocked her out. The prince then kidnapped Aang's body and took off across the frozen tundra outside the oasis.
Though Aang was taken, he eventually came out of his trance and was discovered near a weakened Zuko. He traveled back to the Northern Water Tribe with the identity of the Moon and Ocean Spirits. Admiral Zhao and the former General Iroh eventually made their way into the Spirit Oasis with several firebending soldiers. There, Admiral Zhao explained that he had known about the identity of Tui and La for some time, after having found the information in a vast library. He revealed that he intended to kill the Moon Spirit, which would strip waterbenders of their power.
Upon learning this, Iroh warned the admiral that his actions would cause great damage, not only to the waterbenders, but to the whole world, and that he would return whatever Zhao did to the fish tenfold. Zhao appeared to have listened and released the fish back into the water; however, he abruptly launched a fire blast at the spirit, killing it. The moon subsequently disappeared and all waterbenders in the city lost the power to bend. Aang, however, had not lost hope. His tattoos began to glow and he walked into the pond. There, he fused with La and they began to devastate the Fire Nation war ships.
Meanwhile, General Iroh had suggested that Yue give up her life to Tui because since the spirit had given life to the princess, she might be able to give it back. Yue agreed, but Sokka did not want her to. Yue said that it was her duty to give up her life, and the two kissed and said goodbye just before she disappeared. Tui and La were restored and began once again to encircle each other in a continuing cycle as the moon reappeared. Admiral Zhao was killed by La in revenge for his actions in the Spirit Oasis.
A few weeks after, the waterbending master, Pakku, presented his former pupil, Katara, with a vial of water from the Spirit Oasis. He said it had "special properties". Katara kept this vial throughout the team's adventures in the Earth Kingdom and would later use the water in order to heal the fatal wounds that Princess Azula had inflicted on the Avatar.
The Spirit Oasis is a secluded cove located at the base of a waterfall behind the chief's temple. This unusual place is a lush, warm, tropical oasis and the center of all spiritual activity in the entire North Pole. The tribe believes that the energy of the Moon and Ocean Spirits keep the oasis constantly warm and flourishing. There is a small pond and a spirit gate located on the grassy island. During each full moon, the tribe makes an offering to the spirits in thanks for their protection by placing food and objects beneath the oasis gate.
In the pond in middle of the Spirit Oasis swim two koi fish, one black and one white, who appear ordinary but are in reality the Ocean and Moon Spirits, Tui and La.
The Spirit Oasis is the most spiritual place in the Northern Water Tribe. In fact, the Moon and Ocean Spirits themselves reside in it in the form of two koi fish. The Avatar may enter the Spirit World through this location via meditation. It is strongly implied that the bottom of the pond is an entrance to the Spirit World, as Koh traveled through from the other side to retrieve Ummi.
- According to DVD commentary for "The Siege of the North", this is a place where the Spirit World overlaps with the mortal world. This would further support how Koh was able to travel between the two planes.
- Spirit Oasis water was shown to be far more proficient at healing than ordinary water, as it was capable of resurrecting Aang after he had been killed by Azula's lightning.
- ↑ 1.0 1.1 From older Avatar: The Last Airbender official site, originally on Nick.com (link). No longer updated.
- ↑ "Escape from the Spirit World", Online game
- ↑ "The Siege of the North, Part 1". Aaron Ehasz (writer) & Lauren MacMullan (director). Avatar: The Last Airbender. Nickelodeon. December 2, 2005. No. 19, Book One: Water
- ↑ "The Siege of the North, Part 2". Aaron Ehasz (writer) & Dave Filoni (director). Avatar: The Last Airbender. Nickelodeon. December 2, 2005. No. 20, Book One: Water
- ↑ "The Avatar State". Aaron Ehasz, Elizabeth Welch Ehasz, Tim Hedrick, John O'Bryan (writers) & Giancarlo Volpe (director). Avatar: The Last Airbender. Nickelodeon. March 17, 2006. No. 1, Book Two: Earth
- ↑ "The Crossroads of Destiny". Aaron Ehasz (writer) & Michael Dante DiMartino (director). Avatar: The Last Airbender. Nickelodeon. December 1, 2006. No. 20, Book Two: Earth