I’ve found the sketch in a crumbling codex from the northern citadels. It’s called the Gorgon Launcher – a counterweight trebuchet with an iron‑coated arm that could deliver a single, crushing impact on a gate. The drawings are sketchy, but the mechanism uses a spiral‑shaped pulley system to maximize torque. It’s not exactly modern, but the theory behind it is solid – it’s a lost design that could have turned the tide of any siege.