In to the Light: An Ebon Sourcebook (1999)

From the introduction:

In the beginning the Ebon species evolved on their homeworld of Static much like any other. Very little is known of the times before Intruder’s arrival, only legends and myths found inscribed within the Tas Tuo give any indication of ancient Ebon society. The legends speak of a time when Ebons fought amongst themselves, and eventually matured beyond war and entered into an age of peace; as nomadic tribes, they wandered the turbulent surface of their world, seeking to understand it, but it remained tantalisingly beyond their reach. Evolution began to shape them, granting them abilities to survive the encroaching Ice Age. Here can be found the first glimpses of true Ebb use, in the ability that Intruder would develop into the discipline of Red Thermal. Like other species, the first truly distinct achievement of the Ebons was the harnessing of fire.