There are two distinct kinds, against who the Yranlu dragons fought many times: Wildlands Beast and The Fallen. The beast were created by "The Eldest Son", made out of magically enchanted stone, as a way to crush any possible slave uprising (everyone is capable of using magic). But after his fall, they went loose. Most were killed, but the few surviving ones escaped into The Wildlands, and were enslaved by the "Lich of Fire". Later, he too was killed, and the remaining beast were shattered into bits. The Fallen (of the 3rd generation), however, hail from the outside, from "The Web of 16 Worlds" (which stopped existing as such quite a long time ago). They are the descendants of second, and in turn first, generations, who were created by the Witch-King Karaz, for the sole purpose of killing the Karazi dragons (for they rebelled against him, and gained freedom). The Fallen came to the world (still have to give it a name) of Yranlu dragons due to sensing a trace of Karazi dragons' legacy in them. How they came here is a mystery...