Warrior Cats/Tear Jerker

The Original Series

 * at the end of The Darkest Hour turns many readers into a blubbering pile of snotty goo.
 * Hell, 's'' death scene. Sure, he was a traitorous piece of scum that poisoned a kit, but him dying on the ground, saying that "It's all black... There's nothing left..." was just.... Sad. Then, of course,
 * 's death. Especially when
 * Forest of Secrets has 's death, which is made even worse by the ending where.
 * Cinderpelt's lament of, "I'm never going to be a warrior, am I?"
 * death.
 * Snowkit, a tiny deaf kitten, was carried away by a hawk, all the while crying for help, with no hope of being rescued.
 * Bluestar's  after Forest of Secrets.
 * death. Just when he was getting more screen time and looking important, he's suddenly dead.
 * The death of the great warrior, one of the noblest and pure members of ThunderClan.
 * can hit pretty hard, especially because she was such an innocent and sweet character.
 * is incredibly sad, mostly because it ends with  completely broken.
 * 's death in A Dangerous Path.

The New Prophecy

 * 's death in Moonrise.
 * At the end of Twilight,  dies. Yes, their whole character arc of   ends with them lying dead in ThunderClan territory.
 * The very idea of the Clans leaving the forest which they had lived in for generations.

Power Of Three

 * death, just after a tender moment with.
 * When died, despite his unfortunate.

Omen Of The Stars

 * 's death in Fading Echoes., too.
 * That last line in Sign of the Moon,
 * 's death at the end of The Last Hope.
 * 's death, which is stretched out long enough for one goodbye with.

Expanded Universe
"Mapleshade: "Your punishment is complete now, Crookedstar. You have lost everything."
 * In Code of the Clans, the death of and his warrior name request to his mentor is quite sad.
 * 's death in Secrets of the Clans.
 * Bluestar's Prophecy: It Got Worse
 * Bluestar's Prophecy gives us the deaths of  The first's death is especially heartwrenching.
 * Bluestar's Prophecy as a whole is pretty much just one giant Tear Jerker.
 * "I'll sleep out here now, with you." ARGH. Why, Vicky, why!?
 * in The Rise of Scourge.
 * The Star Crossed Lovers Ryewhisker and Cloudberry in Code of the Clans. One moment, you're pregnant and all's well, but the next your Love Interest dies at the paws of his own clanmate, all just to protect you, driving an even bigger wedge between both of your clans.
 * Crookedstar's speech to Mapleshade at the end of Crookedstar's Promise. Also counts as a Crowning Moment Of Awesome and a Crowning Moment Of Heartwarming.

Crookedstar: "No, Mapleshade. You're wrong. I still have a clan that I love and am proud to lead. And now... ...now everything precious to me is here, in StarClan. My family is waiting here for me, when my ninth life has passed. It's you who have lost. You have no power over me anymore."

Mapleshade: "I have destroyed you!"

Crookedstar: "No, Mapleshade. I still have the cats that I loved. You have nothing and no one.""

"Crookedstar: How can I love her, when everyone I love dies?"
 * Crookedstar's life as Crookedkit was heartwrenching. The whole scene where he is conscious of his twisted jaw and is trying (painfully) to eat outside of the medicine den for the first time but is wracked with shame and embarassment is almost too much to take. Then toss in the total agonizing descriptions of his mother's rejection of him due to his accident and it's a sobfest.
 * And another one from Crookedstar's Promise


 * Crookedstar