Some of the worse endings include Appa being killed and eaten by the swampbenders (and then when Aang is freaking out, they offer some of the meat to him), Suki being killed on the day of the comet leading to Sokka being incinerated by Fire Nation soldiers and Toph falling to her death, Azula's lightning hitting Katara at the Last Agni Kai and Zuko inadvertently gutting her with his swords, young!Azula and young!Zuko being caught listening in on Ozai and Azulon and Ozai murdering Zuko with lightning right there, Katara accidentally ripping Aang, Sokka, and Toph apart with bloodbending.
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Honestly, it's a Darker and Edgier retelling of most of the series, and once you read them, you'll be glad the series had the endings that it DID.
Then, Remember when Zhao said he wouldn't kill the Avatar, but keep him alive, but just barely? He's strapped to a table and has all four limbs chopped off with red-hot garden shears, and is blinded with a hot poker. For example, Katara, in her little undercover mission to save Haru from the Earthbending Prison, is captured and sentenced to the barrocks for the men to play with. It's a series of one shots depicting a rather different ending to what we're expected from episodes and moments in the show.
After reading, you feel like you want to scrub your brain clean of the images. Finally, Zuko goes completely mad from guilt and drinks himself into oblivion, conjuring up detailed delusions of himself joining the Avatar and teaching him firebending, falling in love with Katara, bringing down his father, and ending the war]]. Toph wasn't even in book one, but also gets killed off for no good reason but to add angst. Aang gets both his eyes put out and thrown into prison to live out the remainder of his life in misery. She eventually loses an eye, becomes known as the Widowmaker, and evolves into a sort of proto-Hama. Katara gets her tongue cut out and turned into a gladiator-style "training exercise" for Fire Nation soldiers, to get them to practice fighting a waterbender. The reality: Sokka immediately gets tortured and killed, since the Fire Nation has no use for him. The Avatar: The Last Airbender fanfic "When All Your Dreams Come True." The premise: Zuko succeeds in capturing Aang and his friends sometime during Book One and takes them back to the Fire Nation.Also, one of the aforementioned original characters is a borderline pedophile, and very heavily implied to be sexing it up with Azula.
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using their own blood to rip them apart, a side-story involving some original characters where a troubled soldier tortures his own father by slowly removing his skin in small patches and giving him an occasional hit of opium just to keep him conscious through it, and lastly, Zuko confronting and killing Ozai, who has lost his mind entirely to the point that he thinks he's fighting Iroh instead.
The second installment, Peace, involves, among other things, Katara witnessing Jet's torture and murder at the hands of the Rhinos, and subsequently going on a Roaring Rampage of Revenge. The first installment, War, ends with Ba Sing Se being carpet-bombed to rubble while the characters are trapped underground listening to it and freaking out.