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The gang comes across an ancient library up kept by a spirit who allows them to stay and look around, provided they do not use the knowledge they gain against anyone else. Things start to go downhill after the spirit discovers they are after information to help bring down the Fire Nation. Meanwhile, outside, Toph struggles to protect Appa from sandbenders who want to steal him.
Bending Introduction: Sandbending (assumed to be a form of Earthbending)
Originally aired as a two-part special called "The Fury of Aang".
(While the group is searching for the library)
Toph: (looks up; excited) there it is!
(Sokka and Katara look to where she is pointing and see nothing)
Toph: That's what someone will say when we find this place (waves hand in front of her face to remind them that she is blind).
Katara: You've been hallucinating off cactus juice all day and then you just lick something off the side of a cave!?!
Sokka: I have a natural curiosity!