Carl's buff, concentrated onto every bomb aboard the airship so the word appears floating over each one.
As Party Planner reaches its target over The King's Point, the entire cabin lights up when every bomb on board arms itself at once. Carl concentrates, and Overclocked appears over each bomb in turn.
Seconds later the whole load — the square No Disassemble shield-busters and the round Waffle Maker high-yield tubes — drops through the open floor panels. The first detonations feel like a slap in Carl's chest even from altitude, and several of the castle's shields crack open like an egg.
Carl's enhancement applied to explosives immediately before the drop.