
The dragonkillers are actually ceruleum powered, believe it or not. There's a quest in Coerthas where you're tasked with securing a shipment of ceruleum for Camp Dragonhead's emplacements.
While primarily a fuel source, ceruleum is highly explosive. Coerthas was also a hotspot for ceruleum mining in the past, so it wouldn't be surprising that they incorporated it into their technology. Back in 1.0, the empire had actually infiltrated and secured the Dzemael Darkhold in an effort to harvest the vast stores of ceruleum contained within the natural crystal formations strewn about the caves.
While primarily a fuel source, ceruleum is highly explosive. Coerthas was also a hotspot for ceruleum mining in the past, so it wouldn't be surprising that they incorporated it into their technology. Back in 1.0, the empire had actually infiltrated and secured the Dzemael Darkhold in an effort to harvest the vast stores of ceruleum contained within the natural crystal formations strewn about the caves.