Carl's bomb-making workbench, where Mordecai left the Nitro Sludge blocks that became his biggest bomb.
A few days back on the previous floor, Mordecai left a few little square blocks of Nitro Sludge on Carl's sapper's table — a by-product of a shield potion he had been working on. Carl experimented with them there through a long stretch of trial and error until he found the perfect mix, then packed them into a salvaged Live Ammo Ball casing to build Just Wait Until Your Daddy Gets Home.
A workbench in Carl's bomb studio, cluttered with components and half-finished builds.
The workstation where Carl's explosives are designed and assembled.
Also appears in books you've already read — spoiler-safe to their endings: