Warning: Contains spoilers for The Dawn of Yangchen.
The latest Avatar: The Last Airbender novel, The Dawn of Yangchen, is out, and it hints at a major Monk Gyatso theory being true. Since Yangchen was born hundreds of years before Gyatso’s time, there isn’t anything that explicitly connects them to one another. However, Yangchen’s actions near the end of the story relate to a popular theory about Gyatso to the point that they might even confirm it.
When Monk Gyatso’s skeleton was shown in Avatar: The Last Airbender Book 1, not only were there no signs of damage from firebending, but Gyatso was surrounded by the skeletons of Fire Nation soldiers. Those two factors don’t make a lot of sense if the Fire Nation had killed him, which led to a popular theory that Gyatso actually used his airbending to create a vacuum of air and suffocate the Fire Nation soldiers to death at the cost of his own life. As of now, the theory hasn’t been confirmed, but Zaheer in The Legend of Korra did at least show that airbending can be used to manipulate someone’s oxygen, so there’s something of a basis for it.
Related: Avatar: The Last Airbender Secretly Revealed That Aang Was Lied To
Even more support for the theory comes from the latest Avatar: The Last Airbender novel, The Dawn of Yangchen. In the climax of The Dawn of Yangchen, Avatar Yangchen defeats each member of the Unanimity — a trio of combustionbenders working for the zongdus of the shang system — by using her airbending to erase all of the air around them and make them suffocate until they lose consciousness. The technique is exactly like what Monk Gyatso is theorized to have done, so if a technique like that definitively exists, it’s even more likely that the theory of Avatar's
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