The Fallen are a society of fallen angels, who have been expelled from Skyhall. Each of them has had their wings shorn off, and was tossed into the empty sky. Those survive the fall, through luck or skill, often make their way to Ksal in Perdition Reach. They are composed of angelic criminals, failed revolutionaries, or those who simply caught a bad rap or made a mistake. They all bear the scars of losing their wings, and all their friends and family.
No small number of the Fallen have a pent-up desire for revenge against the angels of Skyhall.