Dragons

The Kalka'shar believed dragons to be a form of demigod, acting in the direct influence of the Gods as Their messengers. Little was known about them as few had come across them besides witnessing them flying overhead both inside and out of the Dome. To speak or otherwise directly interact with a dragon was considered the highest of honours: the sign of a God-touched individual.

Language
It is believed by the Kalka'shar that while the Gods gave them life and influenced their personalities, dragons were in charge of the more physical aspects of their culture -- particularly, they believed the dragons were responsible for teaching language. While there is a general consensus that they likely could make the popping, crackling sound of flames beforehand, many believe the dragons taught the Kalka'shar to hone and control those sounds, and to sing.

This comes from the knowledge that dragons' chirps and hisses (particularly those of young hatchlings) have been observed to be similar to that of New Dome Tongue -- the Common tongue of all interacting species under the Dome, which the Kalka'shar believe to have evolved from the Elder Tongue: the dead language ancient Kalka'shar once spoke.