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Tearjerker: Ravages Of Time
The auhor Chen Mou really loves dwelling on character's deaths and makes them as heart-wrenching as humanly possible. If the character happens to be one who has lived for longer than ten volumes and the readers have grown an attachment with, you won't be able to hold your tears when they go.
The death of Xiao Meng. The moon will go into waning indeed.
Every single major death in Lu Bu's camp: Gao Shun, Chen Gong, but especiallyLu Bu's daughter. Actually, their morale breakdown at the end of Xiapi's campaign is depressing, even if you already knew the outcome.
Dian Wei's last stand. Of course, since this is an adaptation of Ro 3 K, everyone knew it was coming.
Double as kind of a heartwarming and tear-jerking moment, when previously Sun Ce had a nightmare of being severely scolded by his father for his disloyalty to Imperial Han; at his moment of death we see Sun Jian's spirit come back to pick him up, Sun Ce reverting to a happy child, and Sun Jian does not condemn him at all but rather tells Zhou Yu: "He's tired. Let him rest." Glad to know he gets his peace of mind in death.
Chapter 331: "I am now... the last of my village."
Chapter 333: "Haha... people of my village.. you are all here." In that chapter he actually got the better of Xiahou Dun, only to be struck down by Dun's cousin/"brother" Xiahou Yuan. The chapter's even titled "Brothers in Arms"!
Yuan Fang's death. The entire chapter dedicated to his last moment is absolutely heart-breaking. Yuan Fang's smile as he closes his eyes in Xiao Cha's arms... what a way for the "demon king" to go out, in the embrace of his lost love.
Rather unexpectedly, Yuan Shao's death. A proud man, ruler of a rich and powerful clan, reduced to a gardener living on false hope that his favourite son Yuan Fang was still alive. When the truth was revealed, he died of a broken heart.
As Guo Jia has been around for so long and is one of the most popular characters, Chen Mou went to extra miles to make sure his readers wouldn't get over their heartbreaks over his death anytime soon... by giving him one of the most tear-jerking passings to date, not wasting a moment of his dying breaths and devoting the last of his life to plan ahead for Chibi so that Cao Cao's chance in the next showdown against team Zhuge Liang, which he had foreseen to be slim, could rise even by the tiniest bits. He only gave up on clinging to life when Xun Yu, a comrade whose ideals had been at odds with his for so long, took him in his arms and let Guo Jia know he understood and acknowledged the righteousness of Guo Jia's evil justice, which had won Cao Cao half the war, as well as the great sacrifices to his own name and life that he had taken for the sake of the country. Soon later, Guo Jia died in Xun Yu's arms, a smile on his lips. On hindsight, it was a big Pet the Dog move on Xun Yu's part, especially as just a few chapters ago it had been hinted that his genocidal crime on Xuzhou innocents back then actually weighed on Guo Jia's conscience. Readers of Romance of The Three Kingdoms might squint their eyes just a little bit more for finer details in this chapter and find out that this chapter as well as the ones before it are basically a Dying Moment of Awesome Chen Mou had prepared for a beloved character: if the hints were anything to go by, Guo Jia was the one who would save Cao Cao's life in Chibi and delay Sima Yi's coup d'etat for as long as more than 30 years later.
When Liaoyuan Huo's horse is cut down by Cao troops at Changban, he's pressed on all sides by spears and he believes himself about to die, it's not his life that flashes before his eyes... but rather Xiao Meng reaching for him through the myriad of spears, just like the one he'd died under about a decade before.