Katia's large enchanted crossbow, mounted on Donut's back to fire the bolt that kills Huanxin Jinx.
Katia's crossbow formed on Donut's back, snapping into The Scorpion's Bite weapon mount with an ominous click — a large, deadly weapon bigger than the cat carrying it, and initially unloaded. Donut bore the heavy weight of it without difficulty as she continued her stalking circle.
Mordecai loaded it with a single unenchanted bolt whose tip contained his mother's ashes, then walked out of the tent. When it fired, the bolt slammed into the multiple sets of alien eyes of Huanxin Jinx and rocketed the CEO of Icon Industries backwards across the floor to die at Baroness Victory's feet.
A large, deadly enchanted repeating crossbow, noticeably bigger than the cat it is mounted on.
Katia's weapon, borrowed to execute the goddess-broker who was exploiting her.
Also appears in books you've already read — spoiler-safe to their endings: