Bronze Automatons

The Bronze Automatons are the first line of automatons that were built and employed by the Dwarves as a defense mechanism. Though outdated today, they are undoubtedly one of the most important keystones in technological advancements for the world as a whole.
Bronze Automatons were first built sometime around the year 089 2.E., and were developed by Dwarven mechanics as a way to defend their cities from the rampant dragon attacks that had been plaguing them for the last decade. The attacks had begun to pick up in frequency and ferocity, and as such the Dwarves decided that some measures had to be taken to ensure that they were protected against their dragon nemeses. Thus, the Bronze Automatons were drafted in the year 088 2.E., and constructed a year later.
Being designed with dragons in mind, the Bronze Automatons were built out of a metal that conducted heat very well - bronze. Since bronze was such a good conductor of heat, special parts were engineered inside the automatons to work more effectively the hotter they were. This would cause a nasty surprise for any dragon expecting to melt these metallic soldiers. Other dragon-fighting measures and weapons were implemented into the automatons; such as heat-resistant bolts that were fired from a mounted crossbow on the automatons' arms, as well as large reservoirs of water that were expelled as steam when the automaton got hotter as an attack at the dragon.
Over time, the methods for combating dragons grew more and more advanced, and thus the need for the Bronze Automatons was growing obsolete. They were replaced by large ballistas that were armed with gigantic arrows capable of taking out dragons mid-flight, as well as higher quality automatons for ground combat. Even still, no one can deny the importance of Bronze Automatons in Dwarven history.