Elantris: Hrathen's Redemption. This one just left me so bittersweet, crying tears of sadness and joy at once.
Mistborn:TFE: Kelsier's death. It was just so sudden, even though I should have expected the mentor character to die
WoA: Sazed and Tyndwl. Literally all the feels and all the tears at this one. Their romance was so sweet, and then my heart was torn out and stomped upon by Brandon freaking Sanderson. Again.
HoA: The entirety of the ending. 'Nuff said.
TWoK: Tien's death. Character death hits me hard most of the time, but this one more than most. Kaladin and I have quite a few similarities, in that we are both elder brothers looking out for our younger brothers. I put myself in Kal's shoes in that scene, and there went my hold on tears.
WoR: "The Knights Radiant have returned". So Storming Awesome!
OB: Dalinar's Flashbacks, The Girl Who Stood Up, Jasnah's Love, Kaladin and the surrogate Bridge 4's, Elhokar, and Venli's redemption. I'm just a very emotional person, and Oathbringer utterly wrecked me emotionally.
Warbreaker: Lightsong. just Lightsong