There are many interpretations of what exactly occurred when Elsene and the prehistoric Yevim banished Asag from the material realm. What became of Asag's brood after the Great War? Human annals account for the first of the Lords' battles against her brood in Midworld, but the fate of the Rasa—their progenitors—remains unclear.
A sacred purpose among the Faulin is the purification of artifacts that contain Rasan spirits, and the exorcism of individuals said to be corrupted by them. Because it is the case that a Rasa dispossessed of its physical form seeks new embodiment, the Faunlin adopted an ancient Yevim ritual that binds Rasan spirits to powerful objects forged of Iphendi steel and lodestone. After the tradition of the Intercessors (who invented this ritual), such objects are spun into the shape of golden masks.
Many such Rasan Masks fell to Midworld after The Fall. Possessors of such masks are said to be gifted strange powers, as granted by the Rasan spirits contained within them, but the corrupting influence of the Rasa remains.