The Grundstok Thunderers are militarised formations employed by the fleet to help defend it. The endless training and drilling conducted by the Grundstok Academies results in high standards of discipline and marksmanship in their graduates – upon commands from their officer, the Grundcaptain, they march, wheel and ready their aim with awe-inspiring speed and precision. Firing in near-perfect synchronicity, a line of Grundstok Thunderers temporarily disappears among eye-searing flashes and weapon reports as they unleash a storm of munitions that can halt even the most well-armoured foes in their tracks.

Many Endrinmasters take to the skies in mastercrafted dirigible suits, their aether-turbines allowing them to zoom through the air towards skyvessels in need of repair even as an in-built weapons array blasts their enemies into pieces.