Source: Bestiary 3, pg(s). 55
The clockwork leviathan is a serpentine clockwork creature capable of functioning both on land and in water due to its carefully waterproofed components that never rust even after long exposure to saline water. Its breath weapon is a powerful jet of hot steam, and its interior is filled with grinding gears and superheated water. Clockwork leviathans are 25 feet long and weigh just over three tons.