Literally: Sheele’s Teigu, Ecstas (Cutter of Creation) , which takes the form of a massive pair of scissors. Before her death, she passes the Teigu to Mine, asking her to “kill the keepsake”—to use it not as a memorial but as a weapon to end the Empire’s cruelty.
Emotionally: Tatsumi’s childhood keepsake (a small wooden carving from his village). He is forced to let go of his naïve belief that he can save everyone without sacrifice.